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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
The Clutch on my Comet
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<blockquote data-quote="Tom Gaynor" data-source="post: 2802" data-attributes="member: 4034"><p><strong>Clutches</strong></p><p></p><p>If one takes the chaincase cover off and observes what happens when the lever is pulled, invariably one finds that the pressure plate lifts clear, but the plates remain in a single block. ALMOST AS THOUGH THEY WERE STUCK TOGETHER. Obtaining more lift increases the pressure plate clearance. The plates however remain in a single block. </p><p>My Manx, with dry clutch, has about 1/32" lift. If I fail to strip and dry it after a wet meeting, the pressure plate will lift (it has no cover, so it isn't difficult to see) but the plates remain stuck together.</p><p>What I take this to mean is that even if the pressure plate is lifted 30 feet away from the bike, it won't make a blind bit of difference, because the problem is plate "stiction". On the Norton the cure is to part the plates one by one, dry everything off, remove any rust, and put back together again.</p><p>On my twin (with V3 clutch) my experiments indicate that Mobil1 0-something) gives minimum stiction - less than ATF, or the initial straight 40. Once the plates have freed, the clutch is everything I could wish for.</p><p>More lift isn't going to help. IMHO, the only difference using a lever with worse leverage (= better lift) is to make an already light clutch, slightly heavier.</p><p>I'm open to correction.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 2802, member: 4034"] [b]Clutches[/b] If one takes the chaincase cover off and observes what happens when the lever is pulled, invariably one finds that the pressure plate lifts clear, but the plates remain in a single block. ALMOST AS THOUGH THEY WERE STUCK TOGETHER. Obtaining more lift increases the pressure plate clearance. The plates however remain in a single block. My Manx, with dry clutch, has about 1/32" lift. If I fail to strip and dry it after a wet meeting, the pressure plate will lift (it has no cover, so it isn't difficult to see) but the plates remain stuck together. What I take this to mean is that even if the pressure plate is lifted 30 feet away from the bike, it won't make a blind bit of difference, because the problem is plate "stiction". On the Norton the cure is to part the plates one by one, dry everything off, remove any rust, and put back together again. On my twin (with V3 clutch) my experiments indicate that Mobil1 0-something) gives minimum stiction - less than ATF, or the initial straight 40. Once the plates have freed, the clutch is everything I could wish for. More lift isn't going to help. IMHO, the only difference using a lever with worse leverage (= better lift) is to make an already light clutch, slightly heavier. I'm open to correction. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
The Clutch on my Comet
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