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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
compression ratios
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<blockquote data-quote="vibrac" data-source="post: 97504" data-attributes="member: 60"><p>Having exhausted all the obvious carburetor and ignition reasons for not kick starting I come the the forum remark about kickstarting a Comet and being a pussy so I decided that that could be the problem confirmed when I fitted what I call a Harley or chain saw decompressor and bingo the valve was shutting without firing a sure sympton of high compression so it was time to bite the bullet and off with the head, and low and behold what I had always assumed was a 600 cc motor is a 673! (I lost all my race notes years ago) and its compression rato is way up at 9:1! Now having lost 2 stone and not in the flush of youth I can see the problem- no wonder the Foxley could start it and I could not! And no wonder it went so well! its still is a race motor( back then I think it was running in races at 11:1)even though I'detuned' it and thought I was on 8:1 because of the extra 75cc it was at 9:1 well its a big motor for even that so I will go even lower and see if the B***d will start then. If not its a top hat bush and back to standard (boo ho)</p><p>Over confidence and not enough checking I should know better</p></blockquote><p></p>
[QUOTE="vibrac, post: 97504, member: 60"] Having exhausted all the obvious carburetor and ignition reasons for not kick starting I come the the forum remark about kickstarting a Comet and being a pussy so I decided that that could be the problem confirmed when I fitted what I call a Harley or chain saw decompressor and bingo the valve was shutting without firing a sure sympton of high compression so it was time to bite the bullet and off with the head, and low and behold what I had always assumed was a 600 cc motor is a 673! (I lost all my race notes years ago) and its compression rato is way up at 9:1! Now having lost 2 stone and not in the flush of youth I can see the problem- no wonder the Foxley could start it and I could not! And no wonder it went so well! its still is a race motor( back then I think it was running in races at 11:1)even though I'detuned' it and thought I was on 8:1 because of the extra 75cc it was at 9:1 well its a big motor for even that so I will go even lower and see if the B***d will start then. If not its a top hat bush and back to standard (boo ho) Over confidence and not enough checking I should know better [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
compression ratios
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