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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman Drive Sprocket Loose
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<blockquote data-quote="Matty" data-source="post: 91374" data-attributes="member: 1339"><p>Hi</p><p>I have had my Comet for 62 years now and rebuilt the Burman gearbox 3 or 4 times for various reasons but never had a problem with the drive sprocket splines.</p><p>However I have always found that the nut which holds the clutch basket to the mainshaft had always worked a bit loose and damaged the splines in the clutch basket, no matter how tight I had hammered up the big nut.</p><p>Some years ago I had to replace the clutch basket for this reason but fortunately the obviously harder (and very expensive) gearbox mainshaft was OK.</p><p>I feel that the design is rather poor in this area and any shocks on the clutch are bound to try to undo the sprocket nut a little and allow a little slop to develop over time and think that the same will also apply to the output drive sprocket.</p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 91374, member: 1339"] Hi I have had my Comet for 62 years now and rebuilt the Burman gearbox 3 or 4 times for various reasons but never had a problem with the drive sprocket splines. However I have always found that the nut which holds the clutch basket to the mainshaft had always worked a bit loose and damaged the splines in the clutch basket, no matter how tight I had hammered up the big nut. Some years ago I had to replace the clutch basket for this reason but fortunately the obviously harder (and very expensive) gearbox mainshaft was OK. I feel that the design is rather poor in this area and any shocks on the clutch are bound to try to undo the sprocket nut a little and allow a little slop to develop over time and think that the same will also apply to the output drive sprocket. Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman Drive Sprocket Loose
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