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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Timing
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<blockquote data-quote="Hugo Myatt" data-source="post: 35858" data-attributes="member: 99"><p>My Comet dynamo has packed up. I removed the timing cover intending to fit an Alton that I have had on the shelf. I discovered two of the ATD stops (ears) lying at the bottom of the timing chest and the remains of one spring. The other spring and pair of stops are still in place. Fortunately all the timing gears are steel and there is no apparent damage. I am amazed that the ATD continued to function in this state but the bike has shown no symptoms. It was starting easily and running well. I will re-time it with a replacement ATD. My question is what do I time it to at full advance? The engine is in standard spec so do I go by the book? I understand modern fuels require less advance but how much less? If I time it at say 35 degrees before TDC on full advance will the throw of the ATD put the fully retarded position way out?</p><p></p><p>Advice greatly appreciated.</p><p></p><p>Hugo</p></blockquote><p></p>
[QUOTE="Hugo Myatt, post: 35858, member: 99"] My Comet dynamo has packed up. I removed the timing cover intending to fit an Alton that I have had on the shelf. I discovered two of the ATD stops (ears) lying at the bottom of the timing chest and the remains of one spring. The other spring and pair of stops are still in place. Fortunately all the timing gears are steel and there is no apparent damage. I am amazed that the ATD continued to function in this state but the bike has shown no symptoms. It was starting easily and running well. I will re-time it with a replacement ATD. My question is what do I time it to at full advance? The engine is in standard spec so do I go by the book? I understand modern fuels require less advance but how much less? If I time it at say 35 degrees before TDC on full advance will the throw of the ATD put the fully retarded position way out? Advice greatly appreciated. Hugo [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Timing
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