T140E Bonnie-Clutch cushion rubber woe's - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 2 (permalink) Old 08-28-2014, 07:53 AM Thread Starter
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Cool T140E Bonnie-Clutch cushion rubber woe's

G'day Bonnie clutch guru's, I am in the process of rebuilding my clutch with new original friction plates, screwed pins, springs, bolts and the 57-1722 and 57-1723 large and small drive and rebound rubbers(cushions). After stripping and cleaning the clutch centre and shock absorber spider, which hold these rubbers, I did a quick large rubber fit and noticed that the rubber is not as thick (17mm) as the width of the spiders paddles (22mm). Should I be worried that I have been sold the wrong thickness rubbers, or do they get so compressed once the small rubbers are force fitted that the space is soon taken up? I just do not want to damage any, in case I have to take them back to my supplier. Unfortunately the supplier is only open part time, which does not include Fridays! I did notice that the old rubbers were ~22mm thick, but put this down to age, oil contamination and compression due to gear changing, which is what they are supposed to do. Note, my old rubbers were compressible with just my fingers pinching them together. Cheers, John.
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post #2 of 2 (permalink) Old 08-28-2014, 09:32 AM
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Main Motorcycle: 1973 Triumph TR7RV
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Hi John, I just did those a few weeks ago. That is rather normal. When you get them compressed in they widen a fair amount. The rubbers won't be damaged with a test fitting. For an experiment fit the 3 large rubbers & compress them like you're going to fit the small rubbers. You'll see what I mean (or not). When all are fitted mine filled the space with just a slight lowness from edge, or even sticking up on some. Take a screw driver & tuck the edges down so no rubber gets trapped by the outer covers. Mine wanted to do that on some. Look over Lunmand's video on youtube. I made a clutch plate tool as he did. Instead of a wrench, I held the center with a flat metal bar filed to fit the spine nicely. Held that bar in vise & cranked around drum with 3' long lever. They don't want to compress easy. I was able to force in small rubbers with left hand while holding compression tool with right hand.
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