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R75/5 SWB front fork rebuild
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Re: R75/5 SWB front fork rebuild
Re: R75/5 SWB front fork rebuild
After I put things back together, the forks hardly worked! With some research, I found that by torquing the upper fork stanchions against the steering stops that I misaligned the forks! Had really bad stiction!
I'm in the process of realigning the forks then retorque.
My question is how did you torque the fork stanchions?
Thankyou, Mike
- schrader7032
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Re: R75/5 SWB front fork rebuild
https://bmwmotorcycletech.info/frontforks.htm
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
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Re: R75/5 SWB front fork rebuild
So far, the forks seem fine, and without stiction. I will check the top cap tightness after some miles, but I’m happy to do that by ‘feel’.
Two other things: I used the two feeler gauge method to get the damper pistons into the stanchion. Fork leg in vice, 25 thou feelers thin enough to ‘get in’, strong enough to compress the damper piston rings. Also, I put the stanchions back into their sliders with the former rotated 180 deg from when I took them out - as suggested by another above.
For your misaligned forks, there are certainly things written by people far more knowledgeable than me. However, you could try the ‘old’ method. Loosen everything off, pump the forks up and down a few times with the wheel against a wall, the tighten-up from the bottom upwards: wheel, fork brace, pinch bolts, top plugs, fork yoke top nut. (I’m sure that some will disagree with this, but it’s what I do on my old Triumph.)
- r67boxer
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Re: R75/5 SWB front fork rebuild
https://www.youtube.com/watch?v=Oyhg1wYLcG8
K
- drpetemurray
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Re: R75/5 SWB front fork rebuild
After aligning the forks with your preferred method, I use a 2-foot piece of Black pipe ( Gas Pipe to stabilize the top tree ) through the handlebar clamps. You have to offset the pipe to gain clearance to the fasteners. First, torque the stem nut and then the cap nuts incrementally.
Brook is a bit overkill in the alignment process. These forks have a ton of flex when riding and are not always true when in motion. I will say that when the forks compress, they flex less due to tube overlap.
Stroudsburg,Pa
73 R75/5 , 1014 RTW, IBA 359
Re: R75/5 SWB front fork rebuild
Mike
Re: R75/5 SWB front fork rebuild
I am at a loss why these forks won't work. I have checked everything for straightness with dial indicators. Had the fork tubes parallel and checked with a piece of glass even after everything was torqued. It did take a while to get everything aligned.
I did install a new rebuild kit from EME and steering head bearings.
I have no history on the bike and it sat for about 10 years. I believe it has around 65,000 miles on it.
Can the fork tubes have uneven wear inside? They looked good when inspected them, at least to me.
Also, I checked the fork dampers for straightness and the top plate.
I shimmed the fork brace after I found out when I torqued it up it pulled the fork tubes inward. All good on that.
Any ideas out there?
Thank you,
Mike/mcgee