BMW K bikes (Bricks)


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1Back to top Go down   Rallye K75 Empty Rallye K75 Fri Jul 02, 2021 2:16 pm

Triple B

Triple B
active member
active member
Hi all, I've been on and off the Forum for several years using the vast knowledge pool to help me figure out a few issues with previous K's.
I thought it was about time to put a few details in on my latest build.

Found online advertised as a Cafe Racer......it had been attacked with a hacksaw and had a Cafe style hump bolted on then left outside for a winter. I did however turnover and try and start with easy start sprayed in the airbox. 

Rallye K75 S-l16010

As i like a challenge money changed hands and it came home with me.

First issue, fuel pump seized. Ordered a new one and drained tank ready to fit it. The cause of the fuel pump seizure was then found. More water than fuel in the tank. The tank was duly drained and dried, new pump and filter fitted and new fuel. 
A new Odyssey battery was also bolted on. At this stage some unusual gremlins appeared, the bike would try and fire, sometimes actually managing to fire for a second or two and other times not. All connections checked, injectors checked, plugs checked etc. Eventually found a link about a water in the ECU. Popped the silver box open, plugged it in and the bike fired and ticked over! The strip of foam that stops the PCB from vibrating was soaking wet and must have been sending signals all over the back of the PCB. Once dried out i put it all together and it fired and ran with no issues.
Next up time for me to modify the subframe.
Rallye K75 Img_0312
Rallye K75 Img_0310
Rallye K75 Img_0311

Working out the angle for the top subframe tube/seat base plus a couple of additions to the front end to keep me inspired.
After endless hours of cutting, shutting, welding and grinding angles were decided and subframe done. The seat base was a combination of Aluminium and fibreglass to get the rear of the seat tight to the mudguard. An old Husaberg silencer was offered up and just needed tobe shortened by a couple of inches to fit.

Rallye K75 Img_0411
Rallye K75 Img_0410
Rallye K75 Img_0510

Rallye K75 Img_0511

Now most of the major construction was done it was time to try and make everything look good and fit together. Loads more welding and even more grinding to disguise my bad welding.
Hours shaping the seat foam before sending it off to Glen Moger, a top U.K. motorcycle upholsterer @glenmogercycles.
A quick test ride then time for the strip down.

Rallye K75 Img_1010
All stripped down, wheels and frame sent for powder coating. Engine degreased and a new head gasket fitted. Everything else checked out and up to spec.
The engine was then painted with Simoniz engine paint. Once it has gone through a couple of heat cycles this paint gives a good hard finish. I also used this on smaller brackets etc and used a heat gun to put it through a heat cycle....previous use of the oven has proved unpopular with the other half!

Rallye K75 Img_1110

The beginning of the end, loads of shiny bits ready to go back together very carefully. Wheels now fitted with Heidenau Scouts, nice looking adventure tyres not super chunky pretend motocross tyres.

Rallye K75 Img_1210

So all back together and road legal, in this picture i was waiting for the BSK progressive fork springs and tank roundels. These have now been fitted to match the YSS adjustable rear shock. I might get some M Sport style graphics/stripes made for the tank just to add a little more colour.

So there it is, a K75 with standard electrics, ECU in the box with the battery, standard clocks squeezed in behind the KTM headlight and UFO GasGas mudguards/fenders.

Time to get out on the road and get some miles in, then it 'll be up for sale to make room for the next rescue project......an 80's style Endurance Racer on the road.

Thanks for reading,

Carl.

    

2Back to top Go down   Rallye K75 Empty Not A fan Fri Jul 02, 2021 5:01 pm

caveman

caveman
Life time member
Life time member
Not a big fan of most "cafe" bikes; Yours is an exception for me!

I like everything from starting out with an abortion and getting it running first, getting the general profile next, then starting to clean up the look. Also from the sound of your post you seem to want to have some fun with it!

I have the feeling that this is just phase 1 and you will continue to make this bike your own.

Please keep posting not only the modification but the fun you have with it.

    

3Back to top Go down   Rallye K75 Empty Re: Rallye K75 Fri Jul 02, 2021 8:38 pm

K75cster

K75cster
Life time member
Life time member
Yes that is a tasty little K for sure a Rallye K, sort of rolls off the tongue nicely. They certainly dress up better as a Adventure bike than the Cafe set can manage a Cafe or Coffee runner.


__________________________________________________
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.
    

4Back to top Go down   Rallye K75 Empty Re: Rallye K75 Sat Jul 03, 2021 4:50 am

Gaz

Gaz
Life time member
Life time member
Well done on the rescue.

I agree with Keith that if the K's are going to be modified then they come up better as a mild adventure bike than hacked about and called a cafe.

The seat you have had made even looks like you could sit on it for a few hours.

Cheers


__________________________________________________
Gaz
1990 K75 6427509; 1987 R80G/S PD 6292136; 2010 G650GS ZW13381; 95 K1100LT 0232224
    

5Back to top Go down   Rallye K75 Empty Re: Rallye K75 Sat Jul 03, 2021 8:25 am

Triple B

Triple B
active member
active member
Cheers fellas, getting older and collecting injuries from racing has encouraged a more upright riding posing and softer seat  Rallye K75 112350.

Rallye K75 K100_t11

I built this K100 from another stalled project about four years ago, as soon as I sold it I wanted another one. This was at a bike Rally in France, not many people worked out what it was to start with.

    

6Back to top Go down   Rallye K75 Empty Re: Rallye K75 Sat Aug 21, 2021 9:20 am

Triple B

Triple B
active member
active member
Finally got around to getting the graphics done on the KRallye. 
Really brightened it up.

Rallye K75 Img_1411
Rallye K75 Img_1410


__________________________________________________
1988 K75 Dakar style....finished. 
1988 K75 rescued project in pieces.
1966 Triumph T120 Flat  Tracker.
1977 Triumph T140V.
    

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