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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: 94611" data-attributes="member: 1339"><p>Hi</p><p>Have had a look a this long missive about problems with The Comet Burman Gearbox.</p><p>I think most things have been covered one way or another if you have time to wade through it all.</p><p>Between us we have put in to this most of the things I and others have found about the tolerances of the shafts, curing grease leaks with different bearings and spacers with an oil seal at the sprocket drive end eg.</p><p>The spacer/oilseal from Draganfly leaked a bit round the outside so as stated, I had a very small groove about 25 thou wide turned into the outside of the spacer which is held in against the bearing with a big circlip and put in a large diameter but very thin (25 thou) O ring into the groove. This seems to have fixed the grease leak because it was then a tight fit into the bearing housing.</p><p>The slop in the splines in the centre of the clutch has been mentioned - just do the nut up <strong>very tight </strong>with some Loktite,</p><p>A contributor from Austria had a fix for the grease leak from the gear change shafts. This is not 100% fixed but vastly better after modifying the gear shaft bearing and adding some ORings. (details are in another thread I think).</p><p>Anyway my Burman box after around 3,000 miles now seems to be very good but not after quite a bit of heartache to get it right.</p><p>Hope all this is of some help to someone - though I did publish an article in MPH some while ago which covers most of this and probably have a copy on my computer somewhere if anybody is interested.</p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 94611, member: 1339"] Hi Have had a look a this long missive about problems with The Comet Burman Gearbox. I think most things have been covered one way or another if you have time to wade through it all. Between us we have put in to this most of the things I and others have found about the tolerances of the shafts, curing grease leaks with different bearings and spacers with an oil seal at the sprocket drive end eg. The spacer/oilseal from Draganfly leaked a bit round the outside so as stated, I had a very small groove about 25 thou wide turned into the outside of the spacer which is held in against the bearing with a big circlip and put in a large diameter but very thin (25 thou) O ring into the groove. This seems to have fixed the grease leak because it was then a tight fit into the bearing housing. The slop in the splines in the centre of the clutch has been mentioned - just do the nut up [B]very tight [/B]with some Loktite, A contributor from Austria had a fix for the grease leak from the gear change shafts. This is not 100% fixed but vastly better after modifying the gear shaft bearing and adding some ORings. (details are in another thread I think). Anyway my Burman box after around 3,000 miles now seems to be very good but not after quite a bit of heartache to get it right. Hope all this is of some help to someone - though I did publish an article in MPH some while ago which covers most of this and probably have a copy on my computer somewhere if anybody is interested. Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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