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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet badly tuned or just underpowered?
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<blockquote data-quote="gwild" data-source="post: 22966" data-attributes="member: 242"><p>Two up again this weekend and there was still some of the pinging noise if I accelerated hard from low speed, but otherwise better power - cruising at 60 or so seemed possible, but not much more.</p><p>Is it of the opinion of the gathered assembly that I should further hunt for solutions?</p><p></p><p>One further observation: when chasing a twin yesterday at around 50mph, at a certain throttle opening the bike seemed to choke and slow down until I throttled back below that position. I opened the throttle again, the bike slowed, so I opened further and the bike seemed to suck through the problem and then increase in speed as normal. Is this normal behaviour? Does this indicate just a temporarily blocked jet, or something more sinister?</p><p></p><p>A few additional notes relating to your posts above: </p><p>Tom, you said "If at sustained full throttle closing the air-lever slightly increases your speed, you were too weak". Regretfully I forgot to check this, but what is the mechanism governing this? I naively assumed closing air lever reduces air thus more petrol thus slower</p><p></p><p>Tom again, you also said " Take a tooth off the gearbox sprocket, or a couple of teeth off the rear sprocket...". Wouldn't this have opposite effects? It seems to on my bicycle which spins slower and therefore is easier to see.</p><p></p><p>Bill, now you say it I can't find the reference. I'll have another look. Still, seems to start nicely now even when warm.</p><p></p><p>b'knighted please do not worry, I was being facetious- it is easy to forget that tone of voice does not carry well down the internets. Having attempted to sync carbs on a twin I know first hand some of the single's advantages, and am very proud of my bike I built myself even if I still need tutoring in some aspects.</p><p></p><p>gwild</p></blockquote><p></p>
[QUOTE="gwild, post: 22966, member: 242"] Two up again this weekend and there was still some of the pinging noise if I accelerated hard from low speed, but otherwise better power - cruising at 60 or so seemed possible, but not much more. Is it of the opinion of the gathered assembly that I should further hunt for solutions? One further observation: when chasing a twin yesterday at around 50mph, at a certain throttle opening the bike seemed to choke and slow down until I throttled back below that position. I opened the throttle again, the bike slowed, so I opened further and the bike seemed to suck through the problem and then increase in speed as normal. Is this normal behaviour? Does this indicate just a temporarily blocked jet, or something more sinister? A few additional notes relating to your posts above: Tom, you said "If at sustained full throttle closing the air-lever slightly increases your speed, you were too weak". Regretfully I forgot to check this, but what is the mechanism governing this? I naively assumed closing air lever reduces air thus more petrol thus slower Tom again, you also said " Take a tooth off the gearbox sprocket, or a couple of teeth off the rear sprocket...". Wouldn't this have opposite effects? It seems to on my bicycle which spins slower and therefore is easier to see. Bill, now you say it I can't find the reference. I'll have another look. Still, seems to start nicely now even when warm. b'knighted please do not worry, I was being facetious- it is easy to forget that tone of voice does not carry well down the internets. Having attempted to sync carbs on a twin I know first hand some of the single's advantages, and am very proud of my bike I built myself even if I still need tutoring in some aspects. gwild [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet badly tuned or just underpowered?
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