Hi Tony, Is it difficult to fit K100 forks on a R65? or K75's.
Jim, can't comment on the R75 as I have never worked on one.
Fitting the K100 front end to an R65 is actually a doddle, the only thinking required is make up a means of securing the "plate" that mounts the headlight, instruments and blinkers.
You end up with a lot of fork leg above the upper triple clamp if you wish to go on using your side-stand, but that is not of any great moment.
I bought a complete front end, as in forks, upper and lower triple clamps, handlebar mounts, mudguard, brake calipers and front wheel.
To which I added - handle bar risers to take weight off my damaged shoulder, Venhill brake hoses and a Tarozzi brace.
DO expect to rebuild the K100 forks and do buy and fit a new damper rod piston ring.
Do buy new steerign head bearings, it is not a good idea to run a tapered bearign in anythign but the race it left the factory with.
And the big one -
I am very pleased with the outcome.
A few things to rebutt the stuff that people who don't know fly $hit from pepper will tell you.
The bars do not hit the tank - even without the additional riser thhat I have fitted.
The stock steering stops on the lower end of the head stem tube match perfectly to the K100 triple clamp.
You do not lose any noticeable amount of steering lock
The bearings used for both the K100 and R65 (and any other airhead from mid-70s to end of days) are identical.
The paerking lock is in the same spot and works perfectly.
Whilst the spring rate of the K100 is heavier than the R65, it is not excessively so, think R65 with new heavy-duty springs.
Castrol Fork 5 fork fluid will be right in the ball park for most people - watch out as dry the K100 forks take a lot of fluid 475ml if meemory serves.
It looks stock - see my photos elsewhere on this forum.
The K100 front wheel allows you to mount a wide range of superior rubber and the extra grip does not go astray.
The stock R65 single caliper mastercylinder will work perfectly with the duel K100 calipers (2-piston, not 4-piston) providing you use braided lines.
The K100 method of feeding brake fluid down the steering tube is a revelation in terms of not having to run hoses through tight spaces.