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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Primary Drive Ratios and Torque
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<blockquote data-quote="vibrac" data-source="post: 118645" data-attributes="member: 60"><p>I know the ratio is 1.6 I dont know the clutch teeth number (I think all Bobs are the same I suppose its 36*1.6? I only know the front one because its the largest that will allow a chain case that looks like standard.</p><p>If anyone is thinking of doing this I am using the 30mm belt with a bob supplied stronger belt (the egli Racer used 40mm) here are the details</p><p>The clutch will fit inside the chain case but only if the clutch recess inside is milled out until about 1/8"-1/16" wall is left and the clutch cover screw pillars are left about 1/4" deep at the top of the recess. Some of the inside face wall where the belt runs is reduced the inside, the oil level boss and part of the clutch "wall" is also removed. the main-shaft where the thread for the clutch nut runs is shortened by about 1/2"-5/8" because the clutch is thinner and the end of the shaft would hit the clutch spring plate also this means I could reduce the height of the clutch cover to a minimum to increase cornering clearance all in all that leaves 10mm (sorry about metric) gap between cover & crankcase I was going to get some 'gaskets' made out of water cut alloy but in the end I used longer screws and thin tubular spacers Ben made a thin alloy strip that exactly fitted round the gap painted black you would be pushed to see the join</p><p>I am very happy with the result but making that first cut without knowing for certain it would work on a component costing on the way to £500+ to replace was a bit of a worrying moment.</p></blockquote><p></p>
[QUOTE="vibrac, post: 118645, member: 60"] I know the ratio is 1.6 I dont know the clutch teeth number (I think all Bobs are the same I suppose its 36*1.6? I only know the front one because its the largest that will allow a chain case that looks like standard. If anyone is thinking of doing this I am using the 30mm belt with a bob supplied stronger belt (the egli Racer used 40mm) here are the details The clutch will fit inside the chain case but only if the clutch recess inside is milled out until about 1/8"-1/16" wall is left and the clutch cover screw pillars are left about 1/4" deep at the top of the recess. Some of the inside face wall where the belt runs is reduced the inside, the oil level boss and part of the clutch "wall" is also removed. the main-shaft where the thread for the clutch nut runs is shortened by about 1/2"-5/8" because the clutch is thinner and the end of the shaft would hit the clutch spring plate also this means I could reduce the height of the clutch cover to a minimum to increase cornering clearance all in all that leaves 10mm (sorry about metric) gap between cover & crankcase I was going to get some 'gaskets' made out of water cut alloy but in the end I used longer screws and thin tubular spacers Ben made a thin alloy strip that exactly fitted round the gap painted black you would be pushed to see the join I am very happy with the result but making that first cut without knowing for certain it would work on a component costing on the way to £500+ to replace was a bit of a worrying moment. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Primary Drive Ratios and Torque
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