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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing
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<blockquote data-quote="davidd" data-source="post: 168315" data-attributes="member: 1177"><p>It sounds correct. When all the marks on the gears line up, the ex valve and the inlet valve will be at the same lift and that lift will occur at 4 degrees before TDC on the overlap side of the cam, not the side of the cam where you adjust the valve clearance.</p><p></p><p>The marks on the ATD and the small idler are somewhat irrelevant. If the cam timing is correct, ie. the marks on the gears line up, you will then have to check the ignition timing. The accuracy of that timing depends on the taper of the self-extracting nut in the center of the ATD and not on how the gears are lined up with each other. The taper on the self-extracting nut can shift, but it is rare. Check with a degree wheel that the spark occurs where you want it (this might have been 36 or 38 degrees BTDC. If it is not where you want it, put it right and you should be fine.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 168315, member: 1177"] It sounds correct. When all the marks on the gears line up, the ex valve and the inlet valve will be at the same lift and that lift will occur at 4 degrees before TDC on the overlap side of the cam, not the side of the cam where you adjust the valve clearance. The marks on the ATD and the small idler are somewhat irrelevant. If the cam timing is correct, ie. the marks on the gears line up, you will then have to check the ignition timing. The accuracy of that timing depends on the taper of the self-extracting nut in the center of the ATD and not on how the gears are lined up with each other. The taper on the self-extracting nut can shift, but it is rare. Check with a degree wheel that the spark occurs where you want it (this might have been 36 or 38 degrees BTDC. If it is not where you want it, put it right and you should be fine. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing
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