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RE: clutch adjuster nut,20 thou ???
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Posted by DoubleDiamond (UK)   on Wednesday, October 29, 2014 at 04:18
- in reply to: RE: clutch adjuster nut,20 thou ??? posted by darbs on Wednesday, October 29, 2014 at 00:50
The small bearing in the lift arm isn't spec'ed for the 800lb or so load of the clutch. Having just checked it should cope with 500-600lbs, which still menas it is under specified to lift the clutch. It may well have worked OK on the race bikes but its unlikly to last all that long in a road application.
DD
Replies   :
250,000 miles okay which is what my T150 has done, and 35,000 on my X75 ? Also Doug Hele checked it out with the bearing manufacturers who stated that because it was not a constant load, only loading when operating the clutch, then it was acceptable. I would not call using 800lbs on a 500/600 lbs rating bearing a gross overload.
Bear (pun intended) in mind two things:
a) There is always a safety margin in setting load limits in engineering. Typically I would expect a safety margin of 100% on a bearing such as this meaning it will take 1000-1200 lbs without catastrophic failure.
b) As long as the bearing is within its catastrophic failure mode limit it is just a case of load vs life--assuming all other things (lubrication etc) are equal. Bearing (another pun--sorry!) in mind that bearing lives are measured in terms of tens of thousands of hours then I can well understand that these bearings will last for as long as we want in our clutch application.IMHO they will probably outlive us. Any more than that is I suggest overkill.
As always good engineering is about things that work in practice even if the theory points towards them being a bit questionable.
HTH Bearing in mind of course that the little fellow being discussed is very cheap and very easy to replace. As long as it doesnt fail all at once it is of small worry. Compared it to a rear tire, how much does it cost how often must you attend to it?
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