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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Pre war Burman clutch
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<blockquote data-quote="Hugo Myatt" data-source="post: 11292" data-attributes="member: 99"><p><strong>Burman clutch</strong></p><p></p><p>I have a similar problem with the post war Comet/Burman clutch.I have two Comets, one solo and one with a sidecar. Both are in good condition regarding lift mechanisms, splines and plates etc. Both stick over night but both free off fairly easily in the morning. The solo has no problems at all after that but the outfit clutch gets worse as the ride progresses. It starts to drag when changing gear especially changing up, which on the outfit can cause unscheduled changes of direction. The only difference between the clutches is the material on the friction plates. The solo has an ancient friction material that looks like an amalgam of stuff tightly compressed together whereas the outfit clutch is a completely smooth material. It is this material that seems to stick to the steel plates. I have run it on straight 30 weight, 10/40 weight and ATF but nothing makes any difference. When I strip the clutch and clean plates in petrol it works perfectly for about two weeks but then gradually the dragging re-appears. I am beginning to suspect that modern friction materials do not work in wet clutches whatever may be claimed for them. Perhaps we ought to go back to cork!</p></blockquote><p></p>
[QUOTE="Hugo Myatt, post: 11292, member: 99"] [b]Burman clutch[/b] I have a similar problem with the post war Comet/Burman clutch.I have two Comets, one solo and one with a sidecar. Both are in good condition regarding lift mechanisms, splines and plates etc. Both stick over night but both free off fairly easily in the morning. The solo has no problems at all after that but the outfit clutch gets worse as the ride progresses. It starts to drag when changing gear especially changing up, which on the outfit can cause unscheduled changes of direction. The only difference between the clutches is the material on the friction plates. The solo has an ancient friction material that looks like an amalgam of stuff tightly compressed together whereas the outfit clutch is a completely smooth material. It is this material that seems to stick to the steel plates. I have run it on straight 30 weight, 10/40 weight and ATF but nothing makes any difference. When I strip the clutch and clean plates in petrol it works perfectly for about two weeks but then gradually the dragging re-appears. I am beginning to suspect that modern friction materials do not work in wet clutches whatever may be claimed for them. Perhaps we ought to go back to cork! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Pre war Burman clutch
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