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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Valve Timing
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<blockquote data-quote="Matty" data-source="post: 26837" data-attributes="member: 1339"><p>I have had my Comet for 55 years and a while ago thought that the marks on my gears were incorrect because the performance had always been rather flat. I moved the cam timing one whole tooth on the crankshaft pinion, to get the valves with roughly eqal lift at TDC, which really set the valve lift equal about 5deg before TDC. One tooth of the crank pinion means 15degrees change and I could not detect any change in performance at all !!!. So the valve timing can not be very critical on my "fluffy" old Comet which I cruise at 60-70 on the motorways. The lift of the valves is about right at 0.33/0.34 inches, so the cams are not very worn.</p><p></p><p>However setting the timing back to the marks on the timing gears (all original from new but with a new big idler) ie. back to how it was when I bought it in 1956, puts the valve timing so that the valves have equal lift at about 20deg before TDC which I believe is about right for Mk III cams.</p><p></p><p>Have just done 1100 miles last week to and from the Manx rally with no problems for about the 36th time so there can not be too much wrong - perhaps the poor performance is the reason for its great reliability?</p><p></p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 26837, member: 1339"] I have had my Comet for 55 years and a while ago thought that the marks on my gears were incorrect because the performance had always been rather flat. I moved the cam timing one whole tooth on the crankshaft pinion, to get the valves with roughly eqal lift at TDC, which really set the valve lift equal about 5deg before TDC. One tooth of the crank pinion means 15degrees change and I could not detect any change in performance at all !!!. So the valve timing can not be very critical on my "fluffy" old Comet which I cruise at 60-70 on the motorways. The lift of the valves is about right at 0.33/0.34 inches, so the cams are not very worn. However setting the timing back to the marks on the timing gears (all original from new but with a new big idler) ie. back to how it was when I bought it in 1956, puts the valve timing so that the valves have equal lift at about 20deg before TDC which I believe is about right for Mk III cams. Have just done 1100 miles last week to and from the Manx rally with no problems for about the 36th time so there can not be too much wrong - perhaps the poor performance is the reason for its great reliability? Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Valve Timing
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