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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: 111078" data-attributes="member: 2532"><p>Brian,</p><p>You appear to have eliminated all the reasons why the double gear is being incorrectly positioned in top gear...unyet engagement is still intermittent. (What do the dog wear patterns look like on the double gear? Compare the 3rd gear end with top.)</p><p></p><p>So, this only leaves the possibility that the output gear and bearing are moving in the shell so that some of the time it is out of reach. To get back to having say 2.5mm dog overlap the spacer would need to be this thick (or more). This is clearly at odds with 1mm spacers being sometimes used.</p><p></p><p>Try putting just the cam, selector and double gear in the casing, all in the 4th gear position....might have to take the load off the cam pawl spring........and see where everything is. Then try gently prying the gearbox sprocket away from the primary chaincase to see if the output gear moves in.</p><p></p><p>To fit a spacer it'll all have to come out, so why not have another look at the bearing positioning, 72mm o/d spacer and circlip. This all has to be a really tight fit lengthways.</p><p></p><p>Tatty</p></blockquote><p></p>
[QUOTE="tatty500, post: 111078, member: 2532"] Brian, You appear to have eliminated all the reasons why the double gear is being incorrectly positioned in top gear...unyet engagement is still intermittent. (What do the dog wear patterns look like on the double gear? Compare the 3rd gear end with top.) So, this only leaves the possibility that the output gear and bearing are moving in the shell so that some of the time it is out of reach. To get back to having say 2.5mm dog overlap the spacer would need to be this thick (or more). This is clearly at odds with 1mm spacers being sometimes used. Try putting just the cam, selector and double gear in the casing, all in the 4th gear position....might have to take the load off the cam pawl spring........and see where everything is. Then try gently prying the gearbox sprocket away from the primary chaincase to see if the output gear moves in. To fit a spacer it'll all have to come out, so why not have another look at the bearing positioning, 72mm o/d spacer and circlip. This all has to be a really tight fit lengthways. Tatty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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