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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: 27330" data-attributes="member: 1339"><p>Oh Dear you do cause me worry - I have just done a rebuild on my Burman because it was noisy in 3rd. I have not spotted any evidence of the problem you have had because I have never had a problem with it wanting to jump out of top, so did not check how far the 4th gear engaged. Have replaced recently the layshaft and its bronze bearings, both 3rd gears, and the small gear on the layshaft which mates with the output gear. This was a rather greasy job and I do not want to strip the box again to check the dog engagement if I can help it.</p><p>I did not remove the box from the bike to do the job and just pulled the gear assembly out.</p><p> WARNING when pushing the gears back in, the mainshaft and clutch moved back and the metal seal behind the clutch which keeps the oil in the chaincase dropped down behind the flange it sits on on the mainshaft and I had to then strip the primary side and clutch down to replace the disc on the mainshaft - a real pain. The trick would be to take off the access disc over the clutch and put it back on with a pad of cloth behind it before taking the gearbox apart to ensure that the mainshaft can not move back when the gear assembly is worked on. </p><p>I have refilled my box with Thixotropic grease, which a friend who worked as a lubricant expert at Ford Research said he has used with great sucess in Burman Boxes and claims it helps with the leaks as well.</p><p>I think I will take a chance and if mine ain't broke I won't try to fix it - I have only had the Comet 55years and it has only done 80,000 miles so I hope it has some life left in it yet (that goes for me as well!!)</p><p></p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 27330, member: 1339"] Oh Dear you do cause me worry - I have just done a rebuild on my Burman because it was noisy in 3rd. I have not spotted any evidence of the problem you have had because I have never had a problem with it wanting to jump out of top, so did not check how far the 4th gear engaged. Have replaced recently the layshaft and its bronze bearings, both 3rd gears, and the small gear on the layshaft which mates with the output gear. This was a rather greasy job and I do not want to strip the box again to check the dog engagement if I can help it. I did not remove the box from the bike to do the job and just pulled the gear assembly out. WARNING when pushing the gears back in, the mainshaft and clutch moved back and the metal seal behind the clutch which keeps the oil in the chaincase dropped down behind the flange it sits on on the mainshaft and I had to then strip the primary side and clutch down to replace the disc on the mainshaft - a real pain. The trick would be to take off the access disc over the clutch and put it back on with a pad of cloth behind it before taking the gearbox apart to ensure that the mainshaft can not move back when the gear assembly is worked on. I have refilled my box with Thixotropic grease, which a friend who worked as a lubricant expert at Ford Research said he has used with great sucess in Burman Boxes and claims it helps with the leaks as well. I think I will take a chance and if mine ain't broke I won't try to fix it - I have only had the Comet 55years and it has only done 80,000 miles so I hope it has some life left in it yet (that goes for me as well!!) Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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