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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: 38402" data-attributes="member: 1339"><p>Hi All</p><p></p><p>This is another important contribution which I heard about a few days ago, on why the 4th gear dogs on a Comet Burman box may not mesh properly.</p><p></p><p>I thought this reply might be useful to somebody, if I added it to this old thread - even after the thread was thought to be finished about a year ago !!</p><p>It seems that the bronze bush pressed into the output gear which the mainshaft runs in, sometimes works loose and moves inwards into the space where the sliding gear needs be in 4th. This then prevents the 4th gear dog on the sliding gear from fully engaging and hence can cause wear on the dogs, excessive friction on the bronze selector and ultimately meltdown.</p><p> </p><p>I did not know about this when I rebuilt my gearbox a year or so ago and did not check the bush location. I just have to hope that mine is OK - certainly my gearbox has worked fine for 4000 miles or so since I rebuilt it using the findings from this thread.</p><p></p><p>I have written an article which may be published in the VOC magazine next year sometime and this describes my gearbox rebuild and also summarises the steps I took to try to minimise the risk of 4th gear meltdown.</p><p></p><p>Happy Christmas and a Vinnie New Year</p><p></p><p></p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 38402, member: 1339"] Hi All This is another important contribution which I heard about a few days ago, on why the 4th gear dogs on a Comet Burman box may not mesh properly. I thought this reply might be useful to somebody, if I added it to this old thread - even after the thread was thought to be finished about a year ago !! It seems that the bronze bush pressed into the output gear which the mainshaft runs in, sometimes works loose and moves inwards into the space where the sliding gear needs be in 4th. This then prevents the 4th gear dog on the sliding gear from fully engaging and hence can cause wear on the dogs, excessive friction on the bronze selector and ultimately meltdown. I did not know about this when I rebuilt my gearbox a year or so ago and did not check the bush location. I just have to hope that mine is OK - certainly my gearbox has worked fine for 4000 miles or so since I rebuilt it using the findings from this thread. I have written an article which may be published in the VOC magazine next year sometime and this describes my gearbox rebuild and also summarises the steps I took to try to minimise the risk of 4th gear meltdown. Happy Christmas and a Vinnie New Year Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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