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Cush drive rubbers cure
Like all of us that have the XT660`s , the cush drive rubbers wear is a pain.
I found an article some time ago on the XT660.com thread. The chain drive sprocket takes a tremendous load from the power of the engine , which causes the rear wheel bearing to wear excessively , even wearing the Chain Drive Hub Housing , The bearing will become loose in the housing at a later stage, I fitted a double row bearing as apposed th the std single *row bearing. And with Polyurethane rubbers .I got 56 000km without changing the rubbers again. You only have to machine the rear hub bearing housing 5mm deeper / The Bearing I used is still the same dia. as the original. And machine the inner spacer also 5mm shorter. It still uses the Standard Yamaha Seal http://i127.photobucket.com/albums/p...psc5bb6b14.jpg http://i127.photobucket.com/albums/p...ps36e80f90.jpg The following bearings will all work, but only the first two have rubber seals on both sides: FAG 62304-2RSR (2 seals) 4304-2RS (2 seals) SKF 4304 ATN9 (open - no seals) FAG 4304-B-TVH (open - no seals) Their size is 20x52x21mm. http://i127.photobucket.com/albums/p...1-10104855.jpg 1.Polly Rubbers R800 posted in SA ! 2.And R950 posted anywhere in the world , incl, postage 3. Euro`s *65 incl. postage |
:eusa_think: The big question everyone will want to know is...
Have you still got any polyurethane rubbers for sale? |
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Another question. What size is the new bearing? |
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Despite there are bearing with the correct inner diameter (20 mm) and the width of 20,6 mm, i.e. this one 305704-2RSR. Would this be an option or is the wider diameter of 25 mm needed to fix this issue? |
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more stable under side loads as the pull from the chain would apply... In fact is a clever idea:icon_thumright:.... My sprocket carryer will be seeing a bit of lathe time very soon.. I all ready have rubbers I made from 95A urethane sheet... they are as tight as the day I put them in still.... |
Cush Drive Rubber
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Mail me your address and I will tell you what to add for the postage ? |
You have mail.
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what size is the double row bearing? I only found one with 20x52x21. If so, wouldn't I have to have mill 6 mm deeper and shorten the inner spacer 6 mm as well? Regards Marcus |
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