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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Problems
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<blockquote data-quote="Steve Morris" data-source="post: 143172" data-attributes="member: 3648"><p>OK, Ive replaced the plug first, fitted the Denso W20 TT. Gap is 0.0018".</p><p></p><p>Started very easily, second kick, gently warmed it up and it sounded OK, revs cleaner, or appears to, I think the plug has definitely made a difference, but i still have back-firing when the revs come down to idle, which i never had before..</p><p></p><p>Stripped the carb again, clean as a whistle, needle in the middle position, but noticed something odd? The needle from memory was 'pointed' at the end, like a needle, now it looks stubby, almost like a piece has come off, looked in the bottom of the main jet, nothing, no idea how it could have happened, if indeed it is that, (clutching at straws here), so, can anybody please tell me how long the needle should be? (std Amal 229F/1DV)</p><p></p><p>Another thing, and again perhaps i am barking up the wrong tree here as well, the exhaust appears much much noisier than it did before? Almost as if the baffles are missing? </p><p></p><p>Its so frustrating, ive been over what ive done time and time again, but here's the 'pattern'</p><p></p><p>Bike was running OK, but the idle was 'hanging up' when the bike was warm. A 'blip' on the throttle got it down. I replaced the carb with a known good one, still the same. </p><p></p><p>Replaced ATD springs, appeared slightly better but still had the idle hang up. After a few conversations on here i decided to replace the ATD. Got one from Tony Cooper in Halesowen. </p><p></p><p>Removed the timing cover to fit the ATD, and decided to check the cam gears/end float/breather timing etc. Noticed the cam spindle was loose, and the exhaust follower spindle. Ordered and fitted new o/size spindles, re-built cam gears to correct tolerances, end floats etc. Triple checked timing!</p><p></p><p>Set the ignition timing static at 'points just beginning to open at TDC (BOTH VALVES CLOSED).</p><p></p><p></p><p>Put it all back together and started. It started well, better than its ever done in fact, but was backfiring through the exhaust and stuttering. The bike seemed to perform very well, in fact i dont remember it ever being that fast! and the idle hang up was cured.</p><p></p><p>On a 30 mile test, the fuel consumption was awful! In fact as i arrived home it ran out.</p><p></p><p>And the rest as they say is history, </p><p></p><p>I am starting to wonder if the ATD could cause this problem??</p></blockquote><p></p>
[QUOTE="Steve Morris, post: 143172, member: 3648"] OK, Ive replaced the plug first, fitted the Denso W20 TT. Gap is 0.0018". Started very easily, second kick, gently warmed it up and it sounded OK, revs cleaner, or appears to, I think the plug has definitely made a difference, but i still have back-firing when the revs come down to idle, which i never had before.. Stripped the carb again, clean as a whistle, needle in the middle position, but noticed something odd? The needle from memory was 'pointed' at the end, like a needle, now it looks stubby, almost like a piece has come off, looked in the bottom of the main jet, nothing, no idea how it could have happened, if indeed it is that, (clutching at straws here), so, can anybody please tell me how long the needle should be? (std Amal 229F/1DV) Another thing, and again perhaps i am barking up the wrong tree here as well, the exhaust appears much much noisier than it did before? Almost as if the baffles are missing? Its so frustrating, ive been over what ive done time and time again, but here's the 'pattern' Bike was running OK, but the idle was 'hanging up' when the bike was warm. A 'blip' on the throttle got it down. I replaced the carb with a known good one, still the same. Replaced ATD springs, appeared slightly better but still had the idle hang up. After a few conversations on here i decided to replace the ATD. Got one from Tony Cooper in Halesowen. Removed the timing cover to fit the ATD, and decided to check the cam gears/end float/breather timing etc. Noticed the cam spindle was loose, and the exhaust follower spindle. Ordered and fitted new o/size spindles, re-built cam gears to correct tolerances, end floats etc. Triple checked timing! Set the ignition timing static at 'points just beginning to open at TDC (BOTH VALVES CLOSED). Put it all back together and started. It started well, better than its ever done in fact, but was backfiring through the exhaust and stuttering. The bike seemed to perform very well, in fact i dont remember it ever being that fast! and the idle hang up was cured. On a 30 mile test, the fuel consumption was awful! In fact as i arrived home it ran out. And the rest as they say is history, I am starting to wonder if the ATD could cause this problem?? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Problems
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