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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Timing Side Noise
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<blockquote data-quote="chankly bore" data-source="post: 30519" data-attributes="member: 317"><p>As someone once said: "The variety of percussive instruments" make it impossible to isolate a single culprit, but here is a list of known criminals. Alloy large and small idlers, dynamo pinion meshing too deep, worn and/or loose spindles- particularly the Series B/C large idler boss, worn camshafts and followers, tightly meshing (usually nylon) magneto pinion, loose rocker bearings. These are a good start. Piston slap may be heard more clearly once you have solved the foregoing problems. Does the motor burn or blow much oil? Is there evidence of high crankcase pressure i.e. leaks at jointing faces.I hate to say it, but better have a thorough examination of the timing chest, then go further if required. Please let us all know what you find. Steel idlers and one piece Series D large idler boss are prerequisites for a good timing chest.</p></blockquote><p></p>
[QUOTE="chankly bore, post: 30519, member: 317"] As someone once said: "The variety of percussive instruments" make it impossible to isolate a single culprit, but here is a list of known criminals. Alloy large and small idlers, dynamo pinion meshing too deep, worn and/or loose spindles- particularly the Series B/C large idler boss, worn camshafts and followers, tightly meshing (usually nylon) magneto pinion, loose rocker bearings. These are a good start. Piston slap may be heard more clearly once you have solved the foregoing problems. Does the motor burn or blow much oil? Is there evidence of high crankcase pressure i.e. leaks at jointing faces.I hate to say it, but better have a thorough examination of the timing chest, then go further if required. Please let us all know what you find. Steel idlers and one piece Series D large idler boss are prerequisites for a good timing chest. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Timing Side Noise
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