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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Timing
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<blockquote data-quote="timetraveller" data-source="post: 118375" data-attributes="member: 456"><p>It is generally a waste of time, with an engine you do not know the history of, to try to use timing marks. The cams might not be standard or have been pushed into the pinions at any position. The correct way to do it is to use a dial gauge and degree plate and plot a graph of valve lift against engine rotation. That way you will find out what the cam profiles are and can then consider how best to time it. Do it for the whole cam profile in case you have a faulty base circle or whatever. If you lack the time or facilities to do that then arranging it so that there is equal lift on inlet and exhaust cams at about four degrees before top dead centre. This will get the bike running. If you do not have access to a dial gauge or degree plate then you need to find someone who has the time and patience to help.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 118375, member: 456"] It is generally a waste of time, with an engine you do not know the history of, to try to use timing marks. The cams might not be standard or have been pushed into the pinions at any position. The correct way to do it is to use a dial gauge and degree plate and plot a graph of valve lift against engine rotation. That way you will find out what the cam profiles are and can then consider how best to time it. Do it for the whole cam profile in case you have a faulty base circle or whatever. If you lack the time or facilities to do that then arranging it so that there is equal lift on inlet and exhaust cams at about four degrees before top dead centre. This will get the bike running. If you do not have access to a dial gauge or degree plate then you need to find someone who has the time and patience to help. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Timing
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