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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
electric starter problem
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<blockquote data-quote="timetraveller" data-source="post: 3674" data-attributes="member: 456"><p>The original double gears in the drive train were sintered and the bottom gear to take the cylinder for the sprag cluch was hardened and therefore brittle. Several years ago there was talk of changing the bottom gear to see if a hardened cylinder could be 'shrunk' onto a sintered bottom gear. The problem with the brittle original gears was that when a tooth fell off, and they did, it went throught the rest of the drive train and wrecked the lot. I do not know whether this later mod was ever incorporated. One failing of the whole system is that if the bike is ever allowed to run backwards while in gear the sprag cluch will jam and the whole lot is likely to destroy itself. About 18 month ago I was in email contact with Francois trying to put him in touch with a company who could manufacture a Bendix gear for this. I did not hear from him so do not know if he ever found someone to do this at a sensible price. The alternative, seems to me ,to be a pre-engaged starter which should rule out the need for a sprag cluch but whether the overall design precludes this I do not know. Alternatives are a Bob Dunn starter which does not have any of these problems but is noticably present or start from scratch and use a modern clutch with a gear on the back of it and mount a starter where the dynamo was originally to pre-engage with the clutch mounted gear.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 3674, member: 456"] The original double gears in the drive train were sintered and the bottom gear to take the cylinder for the sprag cluch was hardened and therefore brittle. Several years ago there was talk of changing the bottom gear to see if a hardened cylinder could be 'shrunk' onto a sintered bottom gear. The problem with the brittle original gears was that when a tooth fell off, and they did, it went throught the rest of the drive train and wrecked the lot. I do not know whether this later mod was ever incorporated. One failing of the whole system is that if the bike is ever allowed to run backwards while in gear the sprag cluch will jam and the whole lot is likely to destroy itself. About 18 month ago I was in email contact with Francois trying to put him in touch with a company who could manufacture a Bendix gear for this. I did not hear from him so do not know if he ever found someone to do this at a sensible price. The alternative, seems to me ,to be a pre-engaged starter which should rule out the need for a sprag cluch but whether the overall design precludes this I do not know. Alternatives are a Bob Dunn starter which does not have any of these problems but is noticably present or start from scratch and use a modern clutch with a gear on the back of it and mount a starter where the dynamo was originally to pre-engage with the clutch mounted gear. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
electric starter problem
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