The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Barry on February 13, 2015, 06:03:50 AM
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As part of a service I decided to clean and re-grease my centre stand bushes and they certainly needed it . They were bone dry inspite of being greased at least twice in the last five years. I think it needs to be annual task which is no big deal as the stand doesn't necessarily have to come off. I put the bike on the side stand and remove one bush at a time, clean up and apply a liberal coating of moly grease, then tighten back up with a healthy grunt.
Makes me think it's time for a spline lube but I don't quite have the heart for that until it gets a little warmer.
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So I did a much easier job which was to clean and grease the throttle gears. Lots of grease in there already because again I've done it before a couple of times at 2-3 year intervals. I was surprised to find some noticeable wear on the first 2 or 3 throttle sleeve teeth while the cam gear looked fine. The bike only has a little over 20,000 miles so they must wear relatively fast. Sounds like another annual greasing job and even then I see a new throttle sleeve in my not to distant future.
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The metal that these two parts are made of, doesn't help the situation either .
Seems like it's ' pot metal ', I know it files down easily to clean up the teeth on the cam gear .
A little tip, if you replace the cam gear and the throttle tube, if they are the original parts that the bike came with from the factory, you also need to replace the cover as well .
The hole in the cam gear, that's the part with the chain on it, is about 2-3 times the size of the original .
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Good tip Barry, I had to remove my stand- (which was surprisingly simple) to have it welded up. No grease to speak of on the bushes which were a little worn.
I ordered a new pair from Motorworks who sent me the wrong part (too long see pic); a discussion followed and it seems the bushes for the early stand are no longer available. I greased and refitted the old ones - this alone made a huge difference to deploying the stand - a lot easier and smoother.
I guess when the bushes eventually wear out a pair of the new ones could be machined to fit.
Cheers
Dave
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I had only a little wear on mine so they were OK. If you look closely it's likley that the bushes have worn more on one side so on refitting you can make them last a little longer by positioning them so that the unworn side takes the weight.
If I was machining my own bushes I would make them a few thou bigger in diameter for a better fit in the stand.
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If I was machining my own bushes I would make them a few thou bigger in diameter for a better fit in the stand.
I would make them out of Delrin as well. I havent run the numbers but on the TLAR method i think that Delrin would stand up to the use, self lubricating too
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In the 34 years I've had my '81 R65, the problem I have seen, is the flange on the bushing wears out and the center stand falls off .
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Delrin might be a good option if it was strong enough to be clamped real tight. In fact there would be no need to replicate the exact shape of original bushes. a plain parallel bush topped of with a slightly bigger washer would do the job and spread the load of the clamping nut.
I think most wear occurs when the bush is not kept clamped tight and the clamping screw becomes the bearing instead of the outside surface of the bush.