BMW K bikes (Bricks)

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1Back to top Go down   K100 Frame -> K75 Frame Empty K100 Frame -> K75 Frame Thu Feb 11, 2021 3:53 pm

jjefferies

jjefferies
Gold member
Gold member
I recently acquired an '86 K100 that had been sitting in an apt garage in Berkeley for the past 10 years. Basically I believe the motor, wheels etc are in decent shape. But the frame has a great deal of surface rust. At the same time I have a K75 parts bike which has the engine and electrics but no tranny or rear end. My goal is to refurbish the K100 and get it back on the road. The K75 is going to be parted out and the engine and parts put away to replace bits on my other two K75's. Looking at the work involved I'm wondering if it made sense to strip the K75 down, store it's parts and move the K100 parts over to the K75 frame which is in better shape, i.e. less rust. So far I've been told that the K75 is a K100 with one less cylinder. I've no idea of the vintage of the K75 parts bike. Any comments or thoughts on how well this might work or if it's crazy?

    

2Back to top Go down   K100 Frame -> K75 Frame Empty Re: K100 Frame -> K75 Frame Thu Feb 11, 2021 3:58 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
The front down tubes on the frames are different. Since the K75 engine is shorter, the frame has the tubes angled back more than the K100.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

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
    

3Back to top Go down   K100 Frame -> K75 Frame Empty Re: K100 Frame -> K75 Frame Thu Feb 11, 2021 4:07 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
As far as the rust, an afternoon with a wire wheel on a drill will clean up virtually all of it. What's left can be removed chemically or by taking it to a sandblaster. Follow this up with rust converting primer followed by POR15 paint and you will have a frame that will look good for many years to come.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

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
    

4Back to top Go down   K100 Frame -> K75 Frame Empty Re: K100 Frame -> K75 Frame Thu Feb 11, 2021 4:45 pm

jjefferies

jjefferies
Gold member
Gold member
Thanks, that's the sort of thing that isn't immediately obvious to the untrained eye.

    

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