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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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<blockquote data-quote="tatty500" data-source="post: 110890" data-attributes="member: 2532"><p>Brian,</p><p>Like Bill says, there must be something else to blame. The cam moves the double gear into the final drive gear by about 2.5mm. Even with 1mm (40thou) cam end float there should still be engagement with your new parts.</p><p></p><p>Check that the distance from the joint face of the shell to the face of the output gear down inside the box is not more than 110mm.</p><p></p><p>The KS end cam bush flange is 6mm. It is a difficult place to shim because of the undercut on the cam shaft. If the bush is easy to remove put the shim/spacer on the bush(think there's an undercut in this corner too). This can keep it away from 3rd gear's teeth better.</p><p></p><p>Tatty</p></blockquote><p></p>
[QUOTE="tatty500, post: 110890, member: 2532"] Brian, Like Bill says, there must be something else to blame. The cam moves the double gear into the final drive gear by about 2.5mm. Even with 1mm (40thou) cam end float there should still be engagement with your new parts. Check that the distance from the joint face of the shell to the face of the output gear down inside the box is not more than 110mm. The KS end cam bush flange is 6mm. It is a difficult place to shim because of the undercut on the cam shaft. If the bush is easy to remove put the shim/spacer on the bush(think there's an undercut in this corner too). This can keep it away from 3rd gear's teeth better. Tatty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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