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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: 27321" data-attributes="member: 2532"><p>Blogger,</p><p>Thanks.</p><p>This of course is the easy bit, for unless a new double gear is about 3mm longer from the selector groove to the 26 tooth end then the whole thing will happen again.</p><p>The selector cam moves the selector 6mm in both directions. When moving to 3rd this 6mm prodoces 4mm dog engagement so there is 2mm dog clearance when not in 3rd.</p><p>The 6mm movement to give 4th only produces the 1.2mm engagement, so there is 4.8mm dog clearance when in the other gears.</p><p>This must be wrong in my box.</p><p>Is it wrong in all?</p><p>So if another sliding gear is the same dimension I will make a spacer to move the output gear inboard by 2.5mm or so... or whatever I can achieve whilst maintaining some safety margin between the output gear and the fat shoulder of the selector shaft.</p><p></p><p>Regards,</p><p>Tatty</p></blockquote><p></p>
[QUOTE="tatty500, post: 27321, member: 2532"] Blogger, Thanks. This of course is the easy bit, for unless a new double gear is about 3mm longer from the selector groove to the 26 tooth end then the whole thing will happen again. The selector cam moves the selector 6mm in both directions. When moving to 3rd this 6mm prodoces 4mm dog engagement so there is 2mm dog clearance when not in 3rd. The 6mm movement to give 4th only produces the 1.2mm engagement, so there is 4.8mm dog clearance when in the other gears. This must be wrong in my box. Is it wrong in all? So if another sliding gear is the same dimension I will make a spacer to move the output gear inboard by 2.5mm or so... or whatever I can achieve whilst maintaining some safety margin between the output gear and the fat shoulder of the selector shaft. Regards, Tatty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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