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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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<blockquote data-quote="oexing" data-source="post: 133505" data-attributes="member: 1493"><p>What I could not see with this design is how the bushes get their lubrication. Yeah, you assemble with grease but no practical means to replace old grease. Poor lubrication in there will lead to a dragging clutch when you really want no friction for silent 1st gear selecting from stand still. So to achieve this most modern bikes got needle or roller bearings in the clutch gear or sprocket, oiled by gearbox oil or so. </p><p> The inner bush may get some oil from along the gear shaft, but after the o-ring the outer bush will be dry or starved . So when looking for a new place for a seal it would be better to have it at the outer end for leaving more oil to both bushes. </p><p> I made some mod in the sprocket for a needle bearing, the rest is a Kawasaki clutch , modified a lot plus adapters onto the Vincent gear shaft. No oil seal required with a semi wet clutch. But maybe one could get a needle bearing plus seal at the end to work with the standard clutch somehow ?</p><p></p><p> Vic</p><p>[ATTACH=full]39747[/ATTACH]</p><p></p><p></p><p>[ATTACH=full]39748[/ATTACH]</p><p></p><p></p><p>[ATTACH=full]39749[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 133505, member: 1493"] What I could not see with this design is how the bushes get their lubrication. Yeah, you assemble with grease but no practical means to replace old grease. Poor lubrication in there will lead to a dragging clutch when you really want no friction for silent 1st gear selecting from stand still. So to achieve this most modern bikes got needle or roller bearings in the clutch gear or sprocket, oiled by gearbox oil or so. The inner bush may get some oil from along the gear shaft, but after the o-ring the outer bush will be dry or starved . So when looking for a new place for a seal it would be better to have it at the outer end for leaving more oil to both bushes. I made some mod in the sprocket for a needle bearing, the rest is a Kawasaki clutch , modified a lot plus adapters onto the Vincent gear shaft. No oil seal required with a semi wet clutch. But maybe one could get a needle bearing plus seal at the end to work with the standard clutch somehow ? Vic [ATTACH type="full"]39747[/ATTACH] [ATTACH type="full"]39748[/ATTACH] [ATTACH type="full"]39749[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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