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51Back to top Go down    Re: K75kforkurz on Sun Apr 15, 2018 5:24 am

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    Re: K75kforkurz on Tue Apr 17, 2018 5:25 pm

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.



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.


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.


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53Back to top Go down    Re: K75kforkurz on Tue Apr 17, 2018 5:31 pm

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...


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54Back to top Go down    Re: K75kforkurz on Tue Apr 17, 2018 6:02 pm

chris846

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



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


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55Back to top Go down    Re: K75kforkurz on Tue Apr 17, 2018 8:12 pm

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.


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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    Re: K75kforkurz on Wed Apr 18, 2018 1:45 am

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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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57Back to top Go down    Re: K75kforkurz on Wed Apr 18, 2018 3:34 am

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    Re: K75kforkurz on Wed Apr 18, 2018 3:37 am

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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59Back to top Go down    Re: K75kforkurz on Wed Apr 18, 2018 5:50 am

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.


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1992 K100LT 0193214 Alaska Blue 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Mystic Red 58,645 now 74,700 miles
    

60Back to top Go down    Re: K75kforkurz on Thu Apr 19, 2018 7:09 am

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..

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


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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    Re: K75kforkurz on Thu Apr 19, 2018 8:08 am

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.


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"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    Re: K75kforkurz on Wed Apr 25, 2018 4:40 pm

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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!


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63Back to top Go down    Re: K75kforkurz on Wed Apr 25, 2018 7:14 pm

Dai

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


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'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    Re: K75kforkurz on Wed Apr 25, 2018 7:42 pm

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.


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65Back to top Go down    Re: K75kforkurz on Wed Apr 25, 2018 7:52 pm

jmccrary

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looking great!!!

    

66Back to top Go down    Re: K75kforkurz on Thu Apr 26, 2018 3:51 am

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:


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67Back to top Go down    Re: K75kforkurz on Thu Apr 26, 2018 6:44 am

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/


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'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    Re: K75kforkurz on Mon Apr 30, 2018 4:55 pm

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?


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.


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69Back to top Go down    Re: K75kforkurz on Mon Apr 30, 2018 6:12 pm

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.


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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    Re: K75kforkurz on Mon Apr 30, 2018 6:54 pm

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:


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71Back to top Go down    Re: K75kforkurz on Mon Apr 30, 2018 8:25 pm

K75cster

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Ah yes I see you sit that bike well.


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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    Re: K75kforkurz on Fri May 25, 2018 1:59 pm

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.

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.


(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.


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.


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73Back to top Go down    Re: K75kforkurz on Fri May 25, 2018 8:14 pm

Dai

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


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'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    Re: K75kforkurz on Sat May 26, 2018 4:01 am

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 Alaska Blue 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Mystic Red 58,645 now 74,700 miles
    

75Back to top Go down    Re: K75kforkurz on Sat May 26, 2018 4:18 am

chris846

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Cheers guys, much appreciated.


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76Back to top Go down    Re: K75kforkurz on Sat May 26, 2018 5:13 am

chris846

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Brigitte Bardot!

Links hooterbuster!

Rechts war mein favourite.


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77Back to top Go down    Re: K75kforkurz on Wed Jun 06, 2018 5:14 pm

chris846

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And the wheelbase is.....


1466mm!


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78Back to top Go down    Re: K75kforkurz on Wed Jun 06, 2018 5:41 pm

chris846

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1466mm! Das ist mehr kurz als mein hurdlebanger!

Was ist ein hurdlebanger?


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79Back to top Go down    Re: K75kforkurz on Wed Jun 06, 2018 5:59 pm

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???????


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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    Re: K75kforkurz on Wed Jun 06, 2018 6:21 pm

chris846

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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


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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81Back to top Go down    Re: K75kforkurz on Wed Jun 06, 2018 6:56 pm

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??


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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    Re: K75kforkurz on Fri Oct 12, 2018 4:07 pm

chris846

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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....



Yay!



MEIN GOTT!

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

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

............!

............!

............!



Last edited by chris846 on Sat Oct 13, 2018 12:47 am; edited 1 time in total


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83Back to top Go down    Re: K75kforkurz on Fri Oct 12, 2018 4:32 pm

Barry in IN

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Mein Gott! He lives!


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84Back to top Go down    Re: K75kforkurz on Sat Oct 13, 2018 7:47 am

92KK 84WW Olaf

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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!!!!


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1992 K100LT 0193214 Alaska Blue 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Mystic Red 58,645 now 74,700 miles
    

85Back to top Go down    Re: K75kforkurz on Sat Oct 13, 2018 1:24 pm

chris846

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Hey Olaf


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


It all makes sense now....


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