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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Help Please!
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<blockquote data-quote="Howard" data-source="post: 24425" data-attributes="member: 271"><p>I think you'd benefit from a visit to your local section meet, these things are much easier to discuss face to face.</p><p> </p><p>1. Timing wheels - some will tell you the exact end float, I tend to do it by feel. If the spindles have been replaced they may have been installed slightly out of position - I've seen much worse than 1mm variation. I try to get the gears in full mesh by using extra washers in the parts list (I don't know the part Nos) then 2 or 3 thou end float - there's only one thickness of washer so the end float is what it is - one washer less than too tight. The next thing is to shim the followers to make sure they bear on the full width of the cams - this is easier because you can machine the spacers to give the right end float if necessary. </p><p> </p><p>2. Sounds like your timing marks are all to cock - not uncommon! Have a look round the tech help forum here, there's been lots of chat about valve timing recently.</p><p> </p><p>3. Sounds like you've got a twin timing cover. I've never tried putting one on a Comet. I'd be inclined to use a Comet one and sell your twin one - you might make a profit.</p><p> </p><p>4. Big end isn't sealed, it's a very low pressure system. Again, there's been chat about oil feed to big ends here recently that may be useful to you.</p><p> </p><p>Good Luck, we've all been there, Vins aren't always like other engines.</p><p> </p><p>H</p></blockquote><p></p>
[QUOTE="Howard, post: 24425, member: 271"] I think you'd benefit from a visit to your local section meet, these things are much easier to discuss face to face. 1. Timing wheels - some will tell you the exact end float, I tend to do it by feel. If the spindles have been replaced they may have been installed slightly out of position - I've seen much worse than 1mm variation. I try to get the gears in full mesh by using extra washers in the parts list (I don't know the part Nos) then 2 or 3 thou end float - there's only one thickness of washer so the end float is what it is - one washer less than too tight. The next thing is to shim the followers to make sure they bear on the full width of the cams - this is easier because you can machine the spacers to give the right end float if necessary. 2. Sounds like your timing marks are all to cock - not uncommon! Have a look round the tech help forum here, there's been lots of chat about valve timing recently. 3. Sounds like you've got a twin timing cover. I've never tried putting one on a Comet. I'd be inclined to use a Comet one and sell your twin one - you might make a profit. 4. Big end isn't sealed, it's a very low pressure system. Again, there's been chat about oil feed to big ends here recently that may be useful to you. Good Luck, we've all been there, Vins aren't always like other engines. H [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Help Please!
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