BMW K bikes (Bricks)

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51Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Sun Apr 15 2018, 04:24

K75cster


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As far as Zorst's go I'd bet parts of your anatomy would twitch if you were to run a three into two and Siamese it up under the tail piece like the V twin Honda's did.
Wont all those lines weight the bike down?

    

52Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Tue Apr 17 2018, 16:25

chris846

chris846
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....jury's still out on the exhaust, certainly thought about going under/through the seat unit...

Meanwhile, now that I've an idea of the layout, I've started on the frame. The front legs are shortened 10mm to maintain the same rake after the top rails are shortened. This is where having 2 frames was handy - the spare rear seat hoop gets to donate a piece of tube that slides nicely inside the front legs.

K75kforkurz - Page 2 00816

I didn't go for the cut and shut option on the main rails to shorten the frame by the missing cylinder. This was because I could use the gearbox stays from the second frame, which allowed me to import them with a short section of the main rail in order to get a better join. It also makes up a little bit of the reduction in height - the top rails are 10mm closer to the engine anyway. No need to relocate the fuel tank rear mountings either.

I like the way the triangle points now all meet together.
K75kforkurz - Page 2 01013

At the moment I've left the stubs of the original gearbox stays in place. This is only to help with alignment of the new section. It'll take a bit of careful work to get the sections fitting well so's everything will line up without pulling after it's welded.

This is what the short - kurz - frame now looks like.
K75kforkurz - Page 2 01213


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The Longest Lunch
    

53Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Tue Apr 17 2018, 16:31

Barry in IN

Barry in IN
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Seeing that stubby thing reminds me of the old Honda ATC 90 three-wheeler.  
Hey, maybe if you got some big, fat, tires...


__________________________________________________
1992 K75s
    

54Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Tue Apr 17 2018, 17:02

chris846

chris846
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...I'd rather have the Aston Martin and...and...and

K75kforkurz - Page 2 Atc10

Wouldn't mind the wig either, seeing as I'm making a list


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The Longest Lunch
    

55Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Tue Apr 17 2018, 19:12

K75cster

K75cster
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That is coming together so nicely. That is a great solve for the rear triangle. The rear piece isn't going to be stock so you are just going to create the pipework to house that.

This little jigger should really deliver the finest ride going.


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

56Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Apr 18 2018, 00:45

Rickmeister

Rickmeister
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Chris! What's with the big hole in the ceiling of the workshop and the electrical wires dangling down?? I didn't think it rained that much in Barnsley.


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Assumption is the root of all stuff-ups!
    

57Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Apr 18 2018, 02:34

chris846

chris846
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I'm kind of in the low rent section of the accommodation - been relegated, too many bikes see.

As for the rain, we like that. Not yet got running water in Barnsley.

Very Happy


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58Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Apr 18 2018, 02:37

chris846

chris846
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"The rear piece isn't going to be stock"


Oh yes it is, kind of.
C'mon, get that right hemisphere working and see if you can work out what I'm thinking of doing..


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The Longest Lunch
    

59Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Apr 18 2018, 04:50

92KK 84WW Olaf

92KK 84WW Olaf
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Hanging gardens of Babylon coming to mind.. indoor because you live somewhere that's cold and wet.

I suppose we can expect to see K75 plants hanging from it.....

Then maybe its Triffid protection.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 96,650 miles
1983 K100RS 0011175 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell
    

60Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Thu Apr 19 2018, 06:09

K75cster

K75cster
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@chris846 wrote:Still squinting. Seat arrived from cafe4racer, very impressed. Note that there's actually 2 (one's upside down on the bench) the first arrived damaged in transit - the second arrived just 36 hours later! Excellent people.
I'll post some details of the seat unit later, but meanwhile I'm just playing with the lines before I start sawing things to bits. I'm thinking of an Avon/Rickman fairing - the one with the big perspex nosecone. The tape line between the forks and the tank is the bottom edge of the fairing..

K75kforkurz - Page 2 00414
I keep looking and squinting and I'm not sure what you are cooking up, unless you are going to invert the tubes??


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

61Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Thu Apr 19 2018, 07:08

RicK G

RicK G
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I see a telelever front end in this cooking pot. Had some thoughts on this myself for a K1100LT project.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

62Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Apr 25 2018, 15:40

chris846

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K75kforkurz - Page 2 01113
Frame well on the way - the 'new' seat stay will be the old rear loop tidied up and re-positioned. This could be a first, a K cafe racer that actually retains the old rear loop! A victory for K traditionalists everywhere!
K75kforkurz - Page 2 Old_ma10


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63Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Apr 25 2018, 18:14

Dai

Dai
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Where did you get my picture from? I want royalties, so I do!!!


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

64Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Apr 25 2018, 18:42

Woodie

Woodie
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Looking good Chris!  You've changed the wheels as well.  I like 'em.  

You're on your second custom build and I have yet to get my non-modified K back together.  Last night I must have spent two hours cleaning my transmission.  When I started I thought it was never going to improve.  When I finished - and I stress that all I got it to was 'good enough' - I was amazed at how many dirt gathering recesses BMW designed into their castings.


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

65Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Apr 25 2018, 18:52

jmccrary

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looking great!!!

    

66Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Thu Apr 26 2018, 02:51

chris846

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Talking about pictures Dai, I was intrigued by the sign in your avatar. I think I've pinned it down to some highway in India? But I had to stop looking at pictures of it because I started to feel giddy....you actually rode it? I'd have crawled along it inch by inch, digging my fingernails into the gravel.

And Woodie's wheels - The front was kindly donated by my R1100s, but I'm going to try fitting the 25 x 47 bearings from the 3-spoke K fronts, so's I can use a 25mm spindle, which (nearly) fits the KTM/WP forks. Witchcraft*.

The rear is a K1200, but unfortunately it's a 5.5" and needs a little bit too much left offset. So I'm in the market for a 5". I've seen that MW ask over twice as much for the supposedly-rare-as-hen's-teeth 5.5", so I've proposed a straight swap. Still got my hand...and tumbleweed. C'mon MW, this is very important!

*Here's the 'swapping-BMW-bits' design advisory committee, nice people:
K75kforkurz - Page 2 Witche10


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67Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Thu Apr 26 2018, 05:44

Dai

Dai
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@chris846 wrote:Talking about pictures Dai, I was intrigued by the sign in your avatar. I think I've pinned it down to some highway in India?
http://www.simpilot.net/~india/


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

68Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Mon Apr 30 2018, 15:55

chris846

chris846
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A long time ago, on a thread far far away, some optimistic buffoon had a 'good' idea, that sounded so simple:

"So how about:
A K1100 frame, chopped in half and shortened by 78mm around the area of the tank rear mountings."



Just 'chopped in half' right?

K75kforkurz - Page 2 01712
Well for a start the seat loop was never going to fit the new seat/tail unit without modification. So the old seat loop is -slightly- repositioned and now runs upwards and rearwards from C. Turns out it needed widening to align with H, so a bit got added at F.

The original frame was sawn in two at B, just before the point where it kinked outwards. A-B was then bent upwards by 2' to suit the alignment of the seat unit that rests on  it. It also raises the rear of the tank by a few mm.

B-D was added along with D-E. Most of the added bits came from the spare second frame and so A-G-H imported the frame number from the second frame. Thing is, D-E was cut from the back half of the first frame (stay with me) and it has the first frame frame number on it, so this K75k now has two frame numbers, which I find a bit spooky with the Ronnie/Reggie thing that started it all off. Haven't a clue what I'll put on the application for a log book.
K75kforkurz - Page 2 01913
K75kforkurz - Page 2 00912


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69Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Mon Apr 30 2018, 17:12

K75cster

K75cster
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Chris the frame is coming along just fine. Are you planning to change the rear of the tank to resemble to seat's profile? I reckon the frame looks triangulated, a favourite phrase of the road testers of my time. I am envisioning rear-sets on this to carry the peg/seat/bar ratio in a favourable light. The clip-ons will need a fair amount of pull back (you know not just pointing at the ground beside the forks) to give your wrists a fair go. Are you a Geoff Duke or Danny Pedrosa type rider? Not an odd question of you know ergonomics and movement around the bike.

 I must say looking at that frame seat combo I feel you could carry a passenger without any fear of it breaking. Something many before you could not.

Framed up like that I can see why you wanted the R series gearbox and suspension.


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

70Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Mon Apr 30 2018, 17:54

chris846

chris846
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The tank/seat gap is there because the seat unit is designed to be further forward than I have positioned it. The seat unit is matched to the rear of the tank (it's made specifically for a K bike) but it would still need a bit of work to be perfect. If you look at Tborosak's 'super clean' build, you can see he's trimmed the horns for a better fit around the rear of the tank.
I decided that it looked better placed more to the rear but, yes, there's now some work to be done to fair it into the tank. I've not done any glassfiber before....

As for Geoff or Danni, I'm more like this guy:

K75kforkurz - Page 2 Clown10


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71Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Mon Apr 30 2018, 19:25

K75cster

K75cster
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Ah yes I see you sit that bike well.


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

72Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Fri May 25 2018, 12:59

chris846

chris846
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Golly, 24 days and no progress reports. Well the project is very much Not Dead, if only because it provides me with much needed shed-sanity. Things have been slow though, but all the more determined for it.

Cafe Racer steering lock, that's a big joke. I didn't realise that the whole point of putting a set of clipons somewhere near the front wheel spindle, plus a fairing modelled on Brigitte Bardot's left hooter, was to limit steering lock to something akin to the Torrey Canyon. So it's been a big old challenge to try and produce something that can do a U-turn that isn't visible from space.
K75kforkurz - Page 2 00316
The above pic shows full right lock. The fork leg touches the lower frame rail, which pretty much puts the limit on everything, without major major surgery. Steering lock at this point is less than would be obtainable with the standard K1100, high offset/low trail yokes. The KTM yokes have much less offset, so the fork legs are further back, and strike the frame rail much earlier. The fork legs themselves are also much bigger diameter than the original, which compounds this. Despite this, it still gives a measured 70' lock to lock, which is exactly the same as my R1100s, so I'm settling for that (the Madass has a barn owl-like 90' degrees)

Thing is, once the tank is installed, the fork leg strikes the front edge of the tank before it strikes the frame rail. So the tank, and it's welded-on mountings, have had to up sticks and move rearward by 14mm.
K75kforkurz - Page 2 00713

(So much for the simple cut and shut job on the frame. Note also the 'dang, the dog's eaten my spanner' approach on the top yoke nut. I had a pal whose favourite saying was "Patience and a maple leaf will make a silk purse", must remember to get a maple leaf or two for my toolbox, they sound useful...I wasn't the chisel-wielder on this occasion, but I don't have a problem with 'means to an end' methods, the chiesel-wielder in this case looks pretty accurate to me, he/she can do my dentistry any time they like...)

The 70' steering lock is now restored, and the tank and frame rails are protected by the installation of a lock stop on the underside of the frame - which picks up the lock stops on the KTM bottom yoke.
K75kforkurz - Page 2 00415

Brigitte Bardot is a close old fit on the K, just enough room for a thin-gloved hand around the brake lever and throttle on full lock.
K75kforkurz - Page 2 01214


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73Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Fri May 25 2018, 19:14

Dai

Dai
Life time member
Life time member
BB's left hooter seems to be doing a remarkable impression of a Dunstall fairing?


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

74Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Sat May 26 2018, 03:01

92KK 84WW Olaf

92KK 84WW Olaf
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Well Chris if you find the steering lock is a bit like the Torrey Canyon try some oil on it. Unless you have cornoil. Some might think that's a scilly idea but if it doesn't work some heat on it might help.

Darn mad we didn't get to meet up with you at K Fest, would have been mighty fun.

I hope your wife's Achilles tendon is coming on ok, that was a bad one but it will keep you close to base and near the workshop. Good time for cleaning parts too as she won't be able to check up on exactly what's in the partsdishwasher.

I love your posts and your projects.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 96,650 miles
1983 K100RS 0011175 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell
    

75Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Sat May 26 2018, 03:18

chris846

chris846
Life time member
Life time member
Cheers guys, much appreciated.


__________________________________________________
The Longest Lunch
    

76Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Sat May 26 2018, 04:13

chris846

chris846
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K75kforkurz - Page 2 Stefan23 K75kforkurz - Page 2 Teleph27 Brigitte Bardot!

K75kforkurz - Page 2 Josef19 K75kforkurz - Page 2 Teleph27 Links hooterbuster!

K75kforkurz - Page 2 Stefan23 K75kforkurz - Page 2 Teleph27 Rechts war mein favourite.


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77Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Jun 06 2018, 16:14

chris846

chris846
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K75kforkurz - Page 2 00212
K75kforkurz - Page 2 00416
K75kforkurz - Page 2 00913
And the wheelbase is.....

K75kforkurz - Page 2 02613
1466mm!


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The Longest Lunch
    

78Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Jun 06 2018, 16:41

chris846

chris846
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K75kforkurz - Page 2 Stefan24K75kforkurz - Page 2 Teleph28 1466mm! Das ist mehr kurz als mein hurdlebanger!

K75kforkurz - Page 2 Josef20K75kforkurz - Page 2 Teleph28 Was ist ein hurdlebanger?

K75kforkurz - Page 2 Stefan24K75kforkurz - Page 2 Teleph28 K75kforkurz - Page 2 Joelbr11


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79Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Jun 06 2018, 16:59

K75cster

K75cster
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1466! yes!! that's shrunk down nicely. Gawd I think I need some blood pressure pills, This one is exciting A K75 with 5spokes and a Para lever. Man it so works. The shorter the frame tubes are, the thicker they look on the engine.

The present seat height will deliver a gentle bend to the knee when riding, I expect a hands and heels affair as they say???????


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

80Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Jun 06 2018, 17:21

chris846

chris846
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Life time member
Good point about the frame tubes - the K1100 frames have thicker tubes anyway, which adds to the effect.

I've tried to make it compact - here it is next to my 11s

K75kforkurz - Page 2 03511
The wheelbase is only 10mm or so less, but the seat, bars and tank are all lower. I like the K engine, I think many people have called it ugly, so I've tried hard to help it become the ugly duckling that turns heads.


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The Longest Lunch
    

81Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Jun 06 2018, 17:56

K75cster

K75cster
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The riding position on the K75 is going to make it a good riding companion to your R1100s. The R1100s turns heads so it is just going to have to live with the smaller stablemate taking some of the lime light.

You say the K1100 frame is bigger or thicker in wall thickness than the K75??


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

82Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Fri Oct 12 2018, 15:07

chris846

chris846
Life time member
Life time member
Aaaand....

A little light on stock of K75 throttle bodies here in the technological frontier of Barnsley. But we don't even consider that a problem....

K75kforkurz - Page 2 03810
K75kforkurz - Page 2 03910
K75kforkurz - Page 2 04010     Yay!



K75kforkurz - Page 2 Stefan10 MEIN GOTT!

K75kforkurz - Page 2 Josef10 Ho ho ho, was do you mean 'Mein Gott', das was exactly what we did back in der tag, remember, der 'Modular Design'...

K75kforkurz - Page 2 Stefan10 Nicht mit ein bleeding hacksaw, ach mein eyes. Was next fur der mad idiot mit der hacksaw, ein 12 valve K75?

K75kforkurz - Page 2 Josef10 ............!

K75kforkurz - Page 2 Stefan10 ............!

K75kforkurz - Page 2 Avatar10 ............!

K75kforkurz - Page 2 Old_ma10



Last edited by chris846 on Fri Oct 12 2018, 23:47; edited 1 time in total


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83Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Fri Oct 12 2018, 15:32

Barry in IN

Barry in IN
Silver member
Silver member
Mein Gott! He lives!


__________________________________________________
1992 K75s
    

84Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Sat Oct 13 2018, 06:47

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
Good back Chris but your ideas seem rather 'novel'.

I was going to give you a haircut but couldn't find my angle grinder.

Keep it coming!!!!


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 96,650 miles
1983 K100RS 0011175 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell
    

85Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Sat Oct 13 2018, 12:24

chris846

chris846
Life time member
Life time member
Hey Olaf


"Drink!"
"Arse!"
"Fe*k!"
"Good!"
"Back!"


It all makes sense now....


__________________________________________________
The Longest Lunch
    

86Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Mon Dec 03 2018, 16:03

chris846

chris846
Life time member
Life time member
Well it's been a funny old summer. Lots of time spent with the newest plumber/electrician/demolition contractor in the family...
K75kforkurz - Page 2 01215
Lots of time spent having staring contests with the local sheep (man are they good!)...
K75kforkurz - Page 2 02511
So progress has been proper slow...
K75kforkurz - Page 2 03512

K75kforkurz - Page 2 04510
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Plus, I'm in no rush to throw it together just for a result. I've realised that the pleasure is now in the building so, although it will get finished, it'll be a while...


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The Longest Lunch
    

87Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Mon Dec 03 2018, 16:38

Point-Seven-five

Point-Seven-five
Life time member
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O-o-o-o-h, that's a proper cafe fairing.  Very nice!


__________________________________________________
Present:
1994 K75RT
1991 K100RS

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

88Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Mon Dec 03 2018, 18:56

RicK G

RicK G
VIP
VIP
It's no wonder most of the Ks had a fairing, they had to do something to hide the ugly tank. I think that is what spoils most of the cafe conversions is that such an ugly thing stands out so much. You do have a good eye for what looks good as was shown in the madass bike, maybe a paint scheme that changes the hump on the camel. Don't ask me for ideas I like em with a fairing even in stock trim the naked K was not a thing of beauty.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

89Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Mon Dec 03 2018, 19:14

Woodie

Woodie
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That gap between the tank and the air box gives your project the tall look of a Britten to me (my own secret motorcycle fantasy - "Here Andrew, you like old motorcycles, Alfie died and he had this old piece of junk out in the shed....Do us a favour and make it go away.")  Tell me more about the exhaust.  Did you fabricate that in house?  Love it so far.


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

90Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Dec 05 2018, 14:59

chris846

chris846
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John Britten is a hero of mine, up there with Dunlop, Hailwood...the usual roll call I suppose.
Anyway, the exhaust -
K75kforkurz - Page 2 00512These are some of the leftovers. I started with the standard cans from a Triumph Street Triple, which mount as a pair high up either side of the tail unit on the OE bike. The complete one in the above pic is the RH can, which has the wrong bracket orientation (the K75K can goes on the LH side) but the correct angle of dangle for the link pipe. Soooo, it was just a case of disembowelling a LH can (the baffles are cheapo mild steel - unbelievable), cutting off the front end/link pipe, and replacing it with the front end/link pipe from a similarly butchered RH can. The finished item (below pic) just has a perforated pipe down the middle instead of the baffled chambers.
The heat shield is a bit of a bacon slicer with the front overhang, but that's how it was on the OE bike. The link pipe is just a 90 bend joined to a 60 bend, which then replaces the too-small OE link pipe welded to the silencer front end cap.
K75kforkurz - Page 2 01014
Today (yes I've managed two days, well, afternoons working on it this week - yay) I've mostly been getting the clutch mechanism all wrong..
K75kforkurz - Page 2 00119The big and clever high level exhaust has elbowed the clutch actuation arm out of the way, so I shortened and re-routed the OE arm, and made a new bracket for the cable, which mounts on the former battery tray mounting holes. (Yep, the new super-duper lithium battery - which weighs the equivalent of two hydrogen atoms - is going to be relocated somewhere more suitable to its puny size - probably inside the handlebar tube or something - where it will be held in place with a cork...)
Anyway, after making sure the butchered actuation arm maintained the same lever length as the OE (only smart people allowed in this shed) I rustled up a cable, connected it up, pulled the clutch lever and....nothing. Turns out that the F800s clutch lever currently deployed to this hare-brained project has a lever length of 26mm, compared the good 'ole K's 35mm. Turns out too, that dumb asses have been in this shed all along...
Anyway, milled a new end for the actuation arm, which is proportionally shorter, and it now all seems to work okay. Still not got the mighty amount of release movement of the OE setup, but that's because the OE K clutch lever is set a bit further from the bars and so has a longer stroke.
Maybe I should have checked all this beforehand, maybe.
Got a query though. I've been googling this and other forums but not really cracked it. The current assembly has a K75 clutch (it came with the engine), but a gearbox which I think is from a K100. The pushrod seems to release the clutch fine, but I know that the K75 is supposed to have its own pushrod. Is this anything to do with the clutch diaphragm spring- do I need to fit one? All clues appreciated, cheers.


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The Longest Lunch
    

91Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Dec 05 2018, 20:08

Laitch

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@chris846 wrote: The pushrod seems to release the clutch fine, but I know that the K75 is supposed to have its own pushrod. Is this anything to do with the clutch diaphragm spring- do I need to fit one? All clues appreciated, cheers.
http://www.k100-forum.com/t8901-can-a-k100-transmission-push-rod-be-used-in-a-k75-transmission#104752


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1995 K75T 73,000 miles
K75kforkurz - Page 2 Usa-lo10
    

92Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Thu Dec 06 2018, 03:59

chris846

chris846
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Awesome Laitch.
That absolutely makes sense - especially Inge K's post - the pushrod does seem 'too long' on my setup. I'll strip the clutch and compare K100/K75 diaphragm springs when I get chance.
Much obliged.


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The Longest Lunch
    

93Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Thu Dec 06 2018, 10:45

Laitch

Laitch
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Photos from MAX BMW parts fiche.

K75 diaphragm spring
K75kforkurz - Page 2 K75_di11


K100 diaphragm spring

K75kforkurz - Page 2 K100rs10


__________________________________________________
1995 K75T 73,000 miles
K75kforkurz - Page 2 Usa-lo10
    

94Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Thu Dec 06 2018, 12:32

chris846

chris846
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Uberawesome!
In the Mick Walker/Peter Dobson book of the K-series, it mentions the K75 being modified at the development stage in order to cope with the different power pulses. I'm sure that's true, but I'd've thought that a 1000cc clutch would've been just fine in a 750cc motor? 
S'pose that's why BMW are making 1000s of bikes every year and I'm pottering around in an old shed wondering where I've put stuff....

Off to ebayland for a K75 pushrod.
Cheers Laitch


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The Longest Lunch
    

95Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Thu Dec 06 2018, 16:55

Dai

Dai
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@chris846 wrote:Uberawesome!
In the Mick Walker/Peter Dobson book of the K-series, it mentions the K75 being modified at the development stage in order to cope with the different power pulses.
That's a bit of an understatement. Got that book Very Happy


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

96Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Sat Dec 08 2018, 20:17

Woodie

Woodie
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Thanks Chris.  Is there any engineering science to doing an exhaust other than 'collect it off the engine and get it the hell behind you without it all being too loud"?  Oh and make it look cool while you are at it.


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

97Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Sun Dec 09 2018, 04:06

chris846

chris846
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Not in my shed lol.

Seriously though, I've left the standard header well alone - the bit that I've made is very accurately summed up by yourself!

This is a great book:

K75kforkurz - Page 2 00111


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The Longest Lunch
    

98Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Sun Dec 09 2018, 12:03

chris846

chris846
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Well all the main fabrication stuff is more or less done, so it's time to build it up as a working bike, before stripping it again for finishing.
Today I've been mostly faffing with the gearbox. It was finished in black, which I thought would be a pain to strip off, but in the end it wire brushed off easily after just a coat of Nitromors. The ally underneath was in good condition, but I still finished it with Rub 'n Buff, because I think it fills the pores and protects the bare ally. Makes your fingers look like the Tin Man from the Wizard of Oz too.

Part done

K75kforkurz - Page 2 00510

Finished

K75kforkurz - Page 2 00810


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The Longest Lunch
    

99Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Dec 12 2018, 12:54

chris846

chris846
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Oh dear:

K75kforkurz - Page 2 00211
Cleaning the engine, and....no engine number.
 
Bought when I started this project, for fifty quid on Ebay. Just needed a cheap lump to get started and this came up. I collected it from the seller in Lincoln. He was my age, decent house, and we chatted about the K75 he used to own. This and a few other bits were spares that he had acquired back then, kept under his bench and never used. Seemed pukka enough - said he'd been warned/worried about the oil/water pump failing, hence the spare engine. The other bits were also for sale on Ebay. 

My slipshod excuses: it was slinging it down with rain when I collected it, and the engine was fairly grimy. The dust and scrapes on the outer casings were consistent with it being dragged around a floor quite a bit - it looked exactly like he'd said. I didn't bother looking at the engine number - they're not the clearest on these engines, and what would it have told me anyway?

He couldn't guarantee anything about it - I didn't ask him too - hence the cheap price.

So why no engine number? - somebody has removed a goodly amount of metal where it used to be - they definitely didn't want anyone reading the number that used to be stamped there.

Answers on a postcard please. And no, there's nothing as yet that can prove this engine is/was stolen. I should know, after four years dealing with car and bike thieves and ringers.


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The Longest Lunch
    

100Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Dec 12 2018, 16:18

Dai

Dai
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No problem - you know better than I do what Swansea think of engine numbers. Or any vehicle numbers.  Talking of which... some years ago when I changed countries and sent my blue Moto Guzzi V1000G5's logbook in for updating, the silly buggers sent it back with the right address but it was now a 'Motto Guzzi'. So, eventually I got round to sending it back for a name correction and it came back as a Moto Guzzi but now it was black in colour. Somewhat annoyed, I sent the V5 back again and this time it returned as a black 'Motto Guzzi'.

Feck me!... I gave up and my blue Moto Guzzi V1000G5 was legally a black Motto Guzzi until the day it was stolen and torched. I still have some tax discs with 'Motto Guzzi' printed on them.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

101Back to top Go down   K75kforkurz - Page 2 Empty Re: K75kforkurz on Wed Dec 12 2018, 16:54

Two Wheels Better

Two Wheels Better
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From vocabulary.com: A motto is a short sentence or phrase that expresses a rule for sensible behaviour, especially a way of behaving in a particular situation. Our motto is 'Plan for the worst and hope for the best', or favourite saying, like 'When life hands you lemons, make lemonade.' A motto is something you might see on a t-shirt or bumper sticker — a short sentence or phrase that has meaning for that person. Some mottoes have to do with politics, religion, or another belief.


Since it's a Moto Guzzi I reckon it can't be reasonably called 'sensible behaviour', so it must fall under the category of 'another belief', or possibly something to do with hoping for the best.

K75kforkurz - Page 2 652573


__________________________________________________

1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '96 K1100RS, '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

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