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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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<blockquote data-quote="Matty" data-source="post: 111087" data-attributes="member: 1339"><p>Hi Brian</p><p>I am surprised that you are having so much trouble.</p><p>It is quite a while ago I did my box but as Tatty says and I seem to remember I just put enough bits together to put it into 4th gear , then pushed everything into the worst case situation and with a felt tip was somehow able to mark the dogs to see how far they engaged in 4th gear.</p><p>With a shim behind the output gear, and the slop in the cam shaft mostly removed by moving the bush in a bit( and making sure the pins in the bronze selector were not worn much) I think I was able to get almost 4mm of overlap on the dogs in 4th gear with the output gear just missing the selector casting by a bit more than a mm</p><p>It may be a "grandmother sucking eggs situation" but is the indexing of the selector cam OK with respect to the positive stop mechanism ? and could it be that the markings for this alignment are incorrect.</p><p>Have you checked that the bush in the output gear has not moved in because this has also been known to stop the sliding dog from going in far enough.</p><p>I have never changed the pins in the bronze selector or the selector itself in my box except in 1957 when a gear tooth broke off and jammed between the gears wrecking most of the box.</p><p>I believe this was a manufacturing fault of the gear because it just broke off while riding in top gear and has been fine since I replaced the sliding gear and straightened out other parts when I was an apprentice electronics Engineer with a few practical and theoretical mechanical engineering qualifications !!</p><p>Good Luck</p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 111087, member: 1339"] Hi Brian I am surprised that you are having so much trouble. It is quite a while ago I did my box but as Tatty says and I seem to remember I just put enough bits together to put it into 4th gear , then pushed everything into the worst case situation and with a felt tip was somehow able to mark the dogs to see how far they engaged in 4th gear. With a shim behind the output gear, and the slop in the cam shaft mostly removed by moving the bush in a bit( and making sure the pins in the bronze selector were not worn much) I think I was able to get almost 4mm of overlap on the dogs in 4th gear with the output gear just missing the selector casting by a bit more than a mm It may be a "grandmother sucking eggs situation" but is the indexing of the selector cam OK with respect to the positive stop mechanism ? and could it be that the markings for this alignment are incorrect. Have you checked that the bush in the output gear has not moved in because this has also been known to stop the sliding dog from going in far enough. I have never changed the pins in the bronze selector or the selector itself in my box except in 1957 when a gear tooth broke off and jammed between the gears wrecking most of the box. I believe this was a manufacturing fault of the gear because it just broke off while riding in top gear and has been fine since I replaced the sliding gear and straightened out other parts when I was an apprentice electronics Engineer with a few practical and theoretical mechanical engineering qualifications !! Good Luck Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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