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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Carb Spitting back fuel
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<blockquote data-quote="John Appleton" data-source="post: 15563" data-attributes="member: 760"><p>Paul , yep, you can rule out my ramblings! I think, on balance, that I would be checking valve timing if only because I have had a similar problem, but never had a carb cause it. There are no doubt other opinions about this, but you have to start somewhere eliminating possible causes and its fairly easy to get a fair idea if all is well without a major strip down. Just check that the overlap of the valves is equi spaced at 6degrees before TDC. This is also known as "equal lift" (ie. the closing exhaust valve has the same lift as the opening inlet). I have just added that for clarity, not as a comment on your knowlege. John</p><p> </p><p> P.S. Pete has just reminded me that,for some strange reason, his original Comet will do this with BP5ES plugs fitted, BP6ES rectifies the problem.</p></blockquote><p></p>
[QUOTE="John Appleton, post: 15563, member: 760"] Paul , yep, you can rule out my ramblings! I think, on balance, that I would be checking valve timing if only because I have had a similar problem, but never had a carb cause it. There are no doubt other opinions about this, but you have to start somewhere eliminating possible causes and its fairly easy to get a fair idea if all is well without a major strip down. Just check that the overlap of the valves is equi spaced at 6degrees before TDC. This is also known as "equal lift" (ie. the closing exhaust valve has the same lift as the opening inlet). I have just added that for clarity, not as a comment on your knowlege. John P.S. Pete has just reminded me that,for some strange reason, his original Comet will do this with BP5ES plugs fitted, BP6ES rectifies the problem. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Carb Spitting back fuel
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