BMW K bikes (Bricks)

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51Back to top Go down    Re: JJ Cobas K100R Flying Brick on Wed May 20, 2015 2:12 pm

Motorbike Mike


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Lots of orange about!! 



and a new dash from Translogic.

    

52Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue May 26, 2015 7:08 pm

Motorbike Mike

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I finally got around to fitting the filler cap-much better.



....and before anyone mentions it, "Yes I know the tank needs wet-flatting and polishing!"

    

53Back to top Go down    Re: JJ Cobas K100R Flying Brick on Thu May 28, 2015 6:27 pm

floyd

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Man this is awesome.

Loving it a lot! Cant wait to see it!  Also like the look of the airhead you sold.

Anyone know where the real Cobas bikes are these days?


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K100 with lots of K1100 bits - mongrel of a thing...
    

54Back to top Go down    Re: JJ Cobas K100R Flying Brick on Fri May 29, 2015 9:14 am

Motorbike Mike

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@floyd wrote:Man this is awesome.

Loving it a lot! Cant wait to see it!  Also like the look of the airhead you sold.

Anyone know where the real Cobas bikes are these days?
Thanks.
I do have sellers remorse when I think about my twin. 

I've tried so hard to find where the original bikes are (there are 2) but to no avail.
On one line of enquiry I was given the email address of the well known journalist Alan Cathcart. He'd ridden one of the bikes way back....read on.

Hi Alan,
I hope you don't mind me contacting you but this picture I've attached of you has started me on a journey......
Having seen your picture riding the Cobas BMW K100.I thought it would be good idea to build a replica (as near as I could get) of the bike.

I was wondering if you could remember what it rode like,was it quick,did it handle OK,how much development went into the engine etc. I'd be grateful for anything you could remember but understand it's a fair while back.
I also would like to ask if you have any information on the bike's present whereabouts and where it was built? The hardest part to get right is the fairing and I'm sure that the mould still exists somewhere in Spain. I've asked and emailed so many people but not managed to gain any useful information so far.

The bike has been accepted,on the proviso it looks correct,to ride at the Bikers Classic at Spa in July so I've still got lots of hours to put in before then. The engine is running and I did a track day at Cadwell last Friday and it performed well for an 80's heavyweight but it will need to go for the fueling to be mapped as it's all over the place due to some engine modifications. Time is running short!!





[size=15]Hi, Mike,
 
Sorry, but I have to stay right out of this.
 
The owner of the bike today (actually, of both such bikes made) has a very negative take on replicas of the bikes in his collection. Therefore, I’m afraid I cannot do anything to help you in this project.
 
Alan Cathcart


...so it's a dead end for now.[/size]


Thanks Alan !

    

55Back to top Go down    Re: JJ Cobas K100R Flying Brick on Fri May 29, 2015 9:41 am

Motorbike Mike

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I turned up this image of the bike in endurance trim and as I will occasionally ride it on the road,a light bracket was made from aluminium.







I'm about to finish the bracket now and make a sub-loom.

    

56Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Jun 07, 2015 4:45 am

Motorbike Mike

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To try and keep the bike as true to the Cobas bike as possible,I've changed the rear end for an early Mono set up. As one alteration creates another ten,I've had to make another exhaust system because the Mono swing arm is 40mm shorter, the back wheel touched the link pipe. 
I've used K1200RS headers that are 4mm larger in diameter but had to modify around the lump above the gear lever.



The bodywork is painted but needs decals.



    

57Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Jun 07, 2015 5:19 am

charlie99

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good tip about the k1200 headers mike

that should make it flow a little differently 

still stunned that the k1100 headers  are "fixed in place" manifold adaptors ...and the short curved # no 4 pipe doesn't enter at the same angle as the rest ....no wonder that they crack along the length

keep at it


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

58Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Jun 07, 2015 5:24 am

floyd

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What triple clamp is that?


Bike is looking awesome mate.


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K100 with lots of K1100 bits - mongrel of a thing...
    

59Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Jun 07, 2015 5:38 am

Motorbike Mike

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It's a stock K100 16v item. I welded some thin plate on to cover the holes.

    

60Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Jun 07, 2015 8:57 am

Motorbike Mike

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This is what happens when you think to yourself "A bit of cut & shut and it will be OK"
You then stand back and realise it isn't OK and major alterations are required for the right look as it needed a very full looking bottom half.



    

61Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Jun 07, 2015 9:18 am

floyd

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Great basic write up of the JJ Cobas K bikes (link)

Also includes the interesting fact that the (ive never seen it called this anywhere else) BMW CDS (Compact Drive System [engine, gearbox, drive shaft, final drive]) only weighs 76kgs dry. 

Says they wrang 122hp @ 9400rpm out of it. Wonder what was done to the engine. Also says a custom EFI system was used....but failed on debut. Would be interesting to know details.


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K100 with lots of K1100 bits - mongrel of a thing...
    

62Back to top Go down    Re: JJ Cobas K100R Flying Brick on Thu Jun 11, 2015 3:36 pm

Motorbike Mike

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Hi Floyd,
Thanks for that. I'll read it tonight,better still,I'll buy the book!

    

63Back to top Go down    Re: JJ Cobas K100R Flying Brick on Mon Jul 06, 2015 6:22 pm

Motorbike Mike

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Just back from Spa.
The Bikers Classic should on everyone list of things to do. The classic 4 hour Endurance race is amazing,they're so fast at night!!






So we made it to Spa and had a great weekend on the track.
Despite the fact that there are fueling issues, I was pleased with the performance of the Brick. It didn't miss a beat all weekend and I lost count of people asking questions about the bike,lots of Photo's too! It handled well and when the fueling is sorted,it will make a great track bike. The only bikes that completely outclassed us were some of the guys on Superbikes No answer for hot motors with trick chassis' I'm afraid.
I met some nice people and made some useful contacts-what an event!

Next? 1200 TB's,a set of light weight wheels and more engine work.

Watch this space.

    

64Back to top Go down    2 days at Cadwell Park-mixed blessings. on Mon Jul 20, 2015 12:57 pm

Motorbike Mike

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The weekend after Spa saw us go to Cadwell Park in Lincolnshire.
The Sunday was great,weather good and the tracktime was fabulous. A big thanks to Classic Bike Trackdays for organising that.
I won a prize for the Brick!


It was quite emotional as I only ever build bikes to please myself. The fact that someone had decided to give me a very nice Granite plinth was very,very nice. Thanks to practical Sportsbike magazine too,the T shirt fits a treat.



On the Monday it was the BMW owners club Ride Friendly day which again was very emotional......but for the wrong reasons!!




Whilst approaching a slower rider around the outside,he made a sudden lunge for the edge of the track. FK why. I was left with no where to go but the grass. I thought I could save it but a large bump came up and catapulted me out of the seat into the stratosphere. 
The bike isn't too bad,nothing major,just minor damage but it's everywhere.










I'll kick it straight for now and rebuild it over the winter.
Fortunately,I bounced better than expected but did get a (several if I'm honest!) roasting from the Mrs-as if I needed anymore trouble right now!

The high's and low's of biking eh lads?

    

65Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Jul 21, 2015 4:42 am

Comberjohn

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See the camera on the fairing, Mike. Any footage for us to see?


__________________________________________________
Life is not a rehearsal.
2010 VFR 1200F DCT 
2010 R1200GS(gone)
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

66Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Jul 21, 2015 1:02 pm

Motorbike Mike

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@Comberjohn wrote:See the camera on the fairing, Mike. Any footage for us to see?
Hi John,
I didn't have the camera on the bike when I crashed but have some footage from Spa and Cadwell.
I suppose I'll have to upload to Youtube but having not done it before,it may take some time!

    

67Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Jul 21, 2015 3:50 pm

Comberjohn

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Find a ten year old to show you how to do it. Very Happy


__________________________________________________
Life is not a rehearsal.
2010 VFR 1200F DCT 
2010 R1200GS(gone)
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

68Back to top Go down    Re: JJ Cobas K100R Flying Brick on Wed Jul 22, 2015 11:31 am

Motorbike Mike

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@Comberjohn wrote:Find a ten year old to show you how to do it. Very Happy
I eventually found a 10 year old who was prepared to help me out!

    

69Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Jul 28, 2015 2:17 pm

Motorbike Mike

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I couldn't resist starting another tank.
I wanted one narrower at the back to give more room to climb around the bike.
As you can see,it's quite a bit narrower than a stock tank.



    

70Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Jul 28, 2015 4:48 pm

k-rider

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So, you decided to use the tig welder instead of the mallet This time😀


K-rider


71Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Jul 28, 2015 6:30 pm

Motorbike Mike

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Both.
More mallet to come if I decide the front sides need some tough love.  Very Happy

    

72Back to top Go down    Re: JJ Cobas K100R Flying Brick on Thu Nov 19, 2015 5:27 pm

Motorbike Mike

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Hi Guys,
I've just come across some images of the bike in action.
The pics with the yellow helmet were taken at Spa,black helmet at Cadwell Park.
I hope you like them!










    

73Back to top Go down    Re: JJ Cobas K100R Flying Brick on Thu Nov 19, 2015 5:53 pm

Dai

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Nice!


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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: JJ Cobas K100R Flying Brick on Thu Nov 19, 2015 6:18 pm

Waz

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Kool, I just watched the video. Very Kool, almost fell out of my chair leaning over with you around the corners.


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1987 K100 RS
1997 R1100R
1996 R1100GS
    

75Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sat Nov 21, 2015 4:14 pm

88

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@Waz wrote:Kool, I just watched the video. Very Kool, almost fell out of my chair leaning over with you around the corners.
+1 Waz...... Never got the knee down at the kitchen table before 
roundel roundel roundel


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88....May contain nuts!

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

Bike: K100LT 1988. 0172363. AKA the Bullion Brick! Mods: k1100 screen and stands.
K1: 1990. 6374189. Custom Stealth Black paint.
    

76Back to top Go down    Re: JJ Cobas K100R Flying Brick on Mon Nov 23, 2015 9:54 am

Motorbike Mike

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Aside from the sheer weight having it's own effect, the bricks handle quite well when you "tighten" the chassis up.
What are you all waiting for?

    

77Back to top Go down    Re: JJ Cobas K100R Flying Brick on Mon Nov 23, 2015 5:48 pm

Dai

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Well... I've got scrape marks under my boots but never had the pegs down. Does that count?


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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)
    

78Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Nov 24, 2015 11:31 am

Motorbike Mike

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Knee's and belly pan but never the footrests so that's two of us.

    

79Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Nov 24, 2015 12:17 pm

k-rider

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Belly pan, really? I never tried that. But footrest on both sides. Are scrapping the tarmac from time to time

K-rider


80Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Nov 24, 2015 12:42 pm

Motorbike Mike

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My footrests are along the same line as the swing arm pivot and the bike is raised 30mm at the rear.
I have had the right footrest touch down though,when I crashed it!!  Very Happy Very Happy

    

Motorbike Mike

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I thought it was about time I started to pull the Flying Brick apart because it needs some love.
I've ordered new bodywork to replace the damaged fairing, I've started a new tank which will be much narrower at the rear and there's a new engine in bits as I type getting vapour blasted because it's scruffy.
The new engine started life as a K1100LT but we have RS cams, the internals will be lightened as much as possible, 1200 throttle bodies and the head will be skimmed for more compression as piston options are not available. There's lots of piston to valve clearance with the RS cams so no issues there.

There's nothing wrong with the old 8 valve unit, it's a huge spec but I want more power and can't find a 1200 engine for sensible money so 1100 16v it is.

    

82Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Dec 06, 2015 8:43 pm

Inge K.

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@Motorbike Mike wrote:The new engine started life as a K1100LT but we have RS cams,

The K1100LT and the K1100RS have identical camshafts.
Maybe you mixing with the K12, where they differs between the RS/LT.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

83Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Dec 06, 2015 9:03 pm

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Same subject but off track a bit. I was groping about on RealOEM a few weeks ago and it seems that the Australian market had different cams for the K1100 LT and RS than Europe. I didn't check out US bikes.
Inge you are probably better at the interpretation of the parts catalogue what are your thoughts on this.
I think the cams probably are different as I got a set of K1200RS ams from US some time ago and put them into my K1100 and the difference was remarkable. So remarkable I took them out as I didn't like a touring bike standing up at 5000rpm in 2nd gear.


__________________________________________________
"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
    

84Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Dec 06, 2015 9:09 pm

Inge K.

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No surprise as the K12RS (and LT) have different cams than the K11's


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

85Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Dec 06, 2015 9:14 pm

RicK G

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There may have been a few things changed within the ECU as I really dont think that the power should come on that hard and I certainly didn't expect it.
First time my K1100 lifted the front was in 3rd when I was overtaking  and was fairly gentle and I was loaded to the rear quite a bit but then a few times I guned it in 2nd and it stood vertical so not wanting and exciting life at my age I removed them.


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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
    

86Back to top Go down    Re: JJ Cobas K100R Flying Brick on Mon Dec 07, 2015 12:16 pm

Motorbike Mike

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@Inge K. wrote:
@Motorbike Mike wrote:The new engine started life as a K1100LT but we have RS cams,

The K1100LT and the K1100RS have identical camshafts.
Maybe you mixing with the K12, where they differs between the RS/LT.
Inge,
Well spotted and you're absolutely correct. I have K1200RS cams that are a 284 cam-sorry, I omitted the 1200 from my description.

If the 284 cam hits that hard, that will suit my bike just fine. 
If any of you guys have a set of 12RS cams going spare, let me know. I might slip a pair in my K11LT too.

    

87Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Mar 13, 2016 4:22 pm

Oldgoat

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What a beautiful custom project Mike!  Luv the track pics!!  Keep up the outstanding work...
Best,
OG

    

88Back to top Go down    Re: JJ Cobas K100R Flying Brick on Sun Mar 13, 2016 5:51 pm

Motorbike Mike

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Hi OG,
I'm still waiting for my K11 engine with K12 cams, skimmed head to raise compression, lightened internals with lightened and balanced crank.



This is what I have at the moment
so there's plenty to get stuck in to.

Mike.

    

89Back to top Go down    Here we go again. on Mon Mar 28, 2016 7:21 pm

Motorbike Mike

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I have to admit I became distracted by another thread I started so back to it.
I have my K1100 16v engine back with K1200 cams, skimmed head, lightened and balanced crank, slightly reshaped ports, K1200 headers, K1200 oil/water pump to facilitate an oil cooler for better cooling.

I'd only had the motor back a week when I had to be stripped again to fit a K1200RS output shaft to run the new pump assembly.
Here's an easy way to fit the gearbox and drive onto an upturned engine.

Once fitted, I laid everything down and dropped the frame on top and bolted it all up.


Last year I used an 8 valve motor and injection but the 16v injection system is slightly different as the injectors fit into the throttle body inlet stubs, I presume most of you knew that. The 16 valve fuel rail has the pressurised flow  pipe in a different position and has the flow pipe pointing outwards and down. I had to move the pipe to the opposite side so the fuel pipe sat inside the fairing and weld up the disused inlet-nothing's simple. 






Radiator fitted with a fresh coat of wrinkle finish black hi-temp paint. The curved silicone pipe on top of the motor doesn't belong there before I'm asked what it does. Very Happy

    

90Back to top Go down    Re: JJ Cobas K100R Flying Brick on Wed Mar 30, 2016 6:22 pm

Motorbike Mike

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The part that caused all the pain has finally been fitted



    

91Back to top Go down    Re: JJ Cobas K100R Flying Brick on Thu Mar 31, 2016 5:07 am

K75cster

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Looks like a bought one, when do you put it to the test? Be interesting to see how the temp goes in the heat of battle. Are you fitting the oil cooler as well or doing a compare before and after style?


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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.
    

92Back to top Go down    Re: JJ Cobas K100R Flying Brick on Thu Mar 31, 2016 6:38 am

Crazy Frog

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@Motorbike Mike wrote:The part that caused all the pain has finally been fitted


Yes, it looks very professional.

As a reminder, just a tip to avoid your bike/engine tipping on the lift...

Read post #20 here


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

93Back to top Go down    Re: JJ Cobas K100R Flying Brick on Thu Mar 31, 2016 6:48 am

Motorbike Mike

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lol!  That is a great idea bolting the support bars to the side of the motor but unfortunately I have 2 broken bolts in the left side. 
I've got too many jobs to get done to invest any time removing them-one day.

    

94Back to top Go down    Re: JJ Cobas K100R Flying Brick on Thu Mar 31, 2016 8:45 am

Point-Seven-five

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This is how a redneck gits 'er dun:

When yer all done and the engine is back in the frame you can chop up yer lift, throw it in the stove and use it to cook breakfast.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

95Back to top Go down    Re: JJ Cobas K100R Flying Brick on Thu Mar 31, 2016 11:18 am

Motorbike Mike

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No, the wood will have to go on the bed frame. I stole 2 supports to hold the bike up-from the Wife's side obviously.

    

96Back to top Go down    Re: JJ Cobas K100R Flying Brick on Thu Mar 31, 2016 11:23 am

Motorbike Mike

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@K75cster wrote:Looks like a bought one, when do you put it to the test? Be interesting to see how the temp goes in the heat of battle. Are you fitting the oil cooler as well or doing a compare before and after style?
I tried it without an oil cooler last year and it struggled, on the slowdown lap it would boil over.

    

97Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Apr 05, 2016 12:46 pm

Motorbike Mike

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This past 4 days has been spent making an air box to get fresh air to the engine.
I decided as a start I'd use stock K1100 rubber connectors and velocity stacks. The stock rubbers etc wouldn't fit inside the fairing but it was #1 stack being near the to front down tube that threw the other 3 out.


 I made an alloy air box (MK1 version) to start with. It's not huge but I can increase volume on the bottom or start again if need be. 







I doubt that Ron Dennis at McLaren will be worried about my intake development program!!

I've also finally got the oil cooler fitted up. It's rubber mounted as the vibes will tear it apart if not.
It never fails to amaze me how much time it takes to make one off parts. If you want something right it's hours of fit, file, fit, file, drill-you know don't you?





    

98Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Apr 05, 2016 1:23 pm

Chocolate

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Hello Mike!

I'm curious to hear how the bike will run!!!
Well done, looks like a good track bike.

Cheers


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Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
    

99Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Apr 05, 2016 2:05 pm

Two Wheels Better

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Too right, Mike, and my project's just a pile of oem parts bolted together. Hardly a collection of one-offs like this.

I'm still not sure where to place, and of what version, my oil cooler will be. I've a triangular Ducati type, an automotive transmission version, and a larger motorbike type. It's all down to how to mount it as much as where.

I'm enjoying your build notes and look forward to more wheelie pics from your favourite tracks.


__________________________________________________
1987 K100RS, Big Block '93 K11/K12 hybrid, '09 K1300GT, '07 K1200R, '04 R1150RT, '95 R100 Mystic, '77 R75/7.
Have we accomplished half of what we dreamt we would? There may still be time.
    

100Back to top Go down    wow! love it! on Tue Apr 05, 2016 2:09 pm

Neil_art

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wow! love it! looks awesome keep the pictures coming Smile

    

101Back to top Go down    Re: JJ Cobas K100R Flying Brick on Tue Apr 05, 2016 2:27 pm

Motorbike Mike

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Although I've only got last years 8v 1000 to compare with, I'm at least hoping for a more responsive bike.

    

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