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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet: primary chain oil leaking out mainshaft hole behind clutch
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<blockquote data-quote="greg brillus" data-source="post: 129093" data-attributes="member: 597"><p>Hmmm I almost look for a dark corner when my name is mentioned.......... With the newer electric starter kits the machined hole through the inner primary cover is slightly larger than the original oval ones. My guess is that it was easier to simply machine a round hole than program the CNC mill to cut an oval one. The good thing is the surfaces are nice machined alloy.......I'm not familiar with this 'Coke can trick" but I found an easy way is to measure quite accurately the distance gap from the case hole to the back of the large hardened clutch shaft washer, probably around the 2mm mark.......and make up a nice disc shaped washer from rubberized sheet cork, then glue this to the back of the steel washer.........remember that the shaft does and needs some end float, so don't make the disc too thick, it just needs to kiss the alloy housing of the inner primary cover and create a seal......... I carried out this mod not so long ago on a prewar Comet and it worked well........On that particular bike I did use ATF in the primary as using engine type oils was too slippery and i could not stop the clutch from slipping.........This is where ATF should be used if the clutch strength is marginal.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 129093, member: 597"] Hmmm I almost look for a dark corner when my name is mentioned.......... With the newer electric starter kits the machined hole through the inner primary cover is slightly larger than the original oval ones. My guess is that it was easier to simply machine a round hole than program the CNC mill to cut an oval one. The good thing is the surfaces are nice machined alloy.......I'm not familiar with this 'Coke can trick" but I found an easy way is to measure quite accurately the distance gap from the case hole to the back of the large hardened clutch shaft washer, probably around the 2mm mark.......and make up a nice disc shaped washer from rubberized sheet cork, then glue this to the back of the steel washer.........remember that the shaft does and needs some end float, so don't make the disc too thick, it just needs to kiss the alloy housing of the inner primary cover and create a seal......... I carried out this mod not so long ago on a prewar Comet and it worked well........On that particular bike I did use ATF in the primary as using engine type oils was too slippery and i could not stop the clutch from slipping.........This is where ATF should be used if the clutch strength is marginal. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet: primary chain oil leaking out mainshaft hole behind clutch
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