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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Help Please!
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<blockquote data-quote="miked" data-source="post: 24423" data-attributes="member: 1821"><p>I had a fustrating day trying to get my Comet together in time for a debut at 1000 bikes, and as a result my job list is now longer... plus I have a few questions I'm hoping I can get help with.</p><p> </p><p>1. Timing gear end float - I have fitted a new large timing gear I have everything as per the parts book (ET173 & ET173/1), yet when I tighten up the steady plate I am seeing a lot of end float (about 1mm - sorry I think in metric...) - Is this normal?</p><p> </p><p>There's also a little float in the small idler and Cam pinion, but nothing like as much.</p><p> </p><p>2. Valve Timing - I lined up all the marks as per the Richardson red book, but something doesn't seem quite right. My inlet valve appears to be at least partly open on the compression stroke, closing just before TDC. </p><p>I'm presuming the marks are arranged to coincide with the firing stroke as the next time TDC comes around the exhaust is closing as you would expect on the exhaust stroke. </p><p> </p><p>I'm a bit confused as there appears to be at least some compression - any thoughts?</p><p> </p><p>3. Timing cover - The timing cover that came with my machine (it wasn't fitted as the P.O. had started the Timing gear job) has 4 oiling ports. 2 have seals in them, the other 2 are machined and drilled but don't appear to align with anything.</p><p>Would I be correct to assume this is a twin part? (the code isn't the same as the crankcases) I noticed there is a Comet part currently on ebay and while the port bosses are cast, but they don't look machined. So, are they the same castings, but with extra machining on the twin? If so is there an easy way to block the gallery to the 2 redundant ports or would I be wise to try and get the ebay one?</p><p> </p><p>4. Oiling Quill - I can see how it fits into the timing case, but I can't see how it seals to the crank - its a very sloppy fit.</p><p> </p><p>This is my first Vincent project and to be honest I'm starting to feel a little out of my depth, but I'm hoping with a little advice I can still complete it in time.</p><p> </p><p>Many thanks in advance,</p><p> </p><p>Mike</p></blockquote><p></p>
[QUOTE="miked, post: 24423, member: 1821"] I had a fustrating day trying to get my Comet together in time for a debut at 1000 bikes, and as a result my job list is now longer... plus I have a few questions I'm hoping I can get help with. 1. Timing gear end float - I have fitted a new large timing gear I have everything as per the parts book (ET173 & ET173/1), yet when I tighten up the steady plate I am seeing a lot of end float (about 1mm - sorry I think in metric...) - Is this normal? There's also a little float in the small idler and Cam pinion, but nothing like as much. 2. Valve Timing - I lined up all the marks as per the Richardson red book, but something doesn't seem quite right. My inlet valve appears to be at least partly open on the compression stroke, closing just before TDC. I'm presuming the marks are arranged to coincide with the firing stroke as the next time TDC comes around the exhaust is closing as you would expect on the exhaust stroke. I'm a bit confused as there appears to be at least some compression - any thoughts? 3. Timing cover - The timing cover that came with my machine (it wasn't fitted as the P.O. had started the Timing gear job) has 4 oiling ports. 2 have seals in them, the other 2 are machined and drilled but don't appear to align with anything. Would I be correct to assume this is a twin part? (the code isn't the same as the crankcases) I noticed there is a Comet part currently on ebay and while the port bosses are cast, but they don't look machined. So, are they the same castings, but with extra machining on the twin? If so is there an easy way to block the gallery to the 2 redundant ports or would I be wise to try and get the ebay one? 4. Oiling Quill - I can see how it fits into the timing case, but I can't see how it seals to the crank - its a very sloppy fit. This is my first Vincent project and to be honest I'm starting to feel a little out of my depth, but I'm hoping with a little advice I can still complete it in time. Many thanks in advance, Mike [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Help Please!
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