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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: 110924" data-attributes="member: 2532"><p>Brian,</p><p>It sounds like the output bearing is not quite in the right place.</p><p></p><p>Sadly when I compared several boxes all those years ago a lot of the measurements I made were comparative, not absolute. However, I think you need to check that that the output bearing is properly home directly against the end of its hole.......as you have also said there isn't enough depth left for a Draganfly seal kit.</p><p></p><p>The gap between the KS and drive ball races is 138mm inside, 170mm outside....if you do remove the output gear to measure.</p><p> Only other thing I noticed is that the radius between the 37.1mm bore and face of the inner race of the output bearing is sometimes large, whilst the 44.2mm shouldered down face on the output gear that rests on the bearing can be only just big enough diameter to give decent contact on the bearing.</p><p> From this bearing face on the gear to its big inside face was between 26.2 and 26.7mm.</p><p></p><p>That 110 dimension I gave was the biggest I found . Probably "109and a bit" is correct.</p><p></p><p>The cam bush has always been made of rubbish, and made worse for wear by the tapered bell mouth.</p><p></p><p>Oh, and on the outside. The outside face of the final drive sprocket is 34.5mm away from the end face of the casing top mounting boss where the big bolt goes through.</p><p></p><p>Regards Tatty</p></blockquote><p></p>
[QUOTE="tatty500, post: 110924, member: 2532"] Brian, It sounds like the output bearing is not quite in the right place. Sadly when I compared several boxes all those years ago a lot of the measurements I made were comparative, not absolute. However, I think you need to check that that the output bearing is properly home directly against the end of its hole.......as you have also said there isn't enough depth left for a Draganfly seal kit. The gap between the KS and drive ball races is 138mm inside, 170mm outside....if you do remove the output gear to measure. Only other thing I noticed is that the radius between the 37.1mm bore and face of the inner race of the output bearing is sometimes large, whilst the 44.2mm shouldered down face on the output gear that rests on the bearing can be only just big enough diameter to give decent contact on the bearing. From this bearing face on the gear to its big inside face was between 26.2 and 26.7mm. That 110 dimension I gave was the biggest I found . Probably "109and a bit" is correct. The cam bush has always been made of rubbish, and made worse for wear by the tapered bell mouth. Oh, and on the outside. The outside face of the final drive sprocket is 34.5mm away from the end face of the casing top mounting boss where the big bolt goes through. Regards Tatty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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