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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series 'C' Comet Idle Hanging Up
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<blockquote data-quote="Steve Morris" data-source="post: 122534" data-attributes="member: 3648"><p>OK, I have an issue with the Comet. The idle hangs up when warm, i posted about this a while ago, and the general consensus was that as i am running the original 229 carb, the carb slide is potentially worn which would cause the hang up. I met with the previous owner at the weekend, and he had found the carb that was on the bike when he used it, an AMAL Concentric. He said the bike was fine on this carb, so yesterday i set about fitting it. No real issues apart from i had to modify the throttle cable slightly but it went on and started pretty well. I have to say at this point i did strip the concentric down before i fitted it and gave it a thorough check over and clean out.</p><p></p><p>Went for a short test ride, and the difference between the concentric and the 229 was minimal, the concentric revs slightly cleaner, but performance is almost identical. </p><p></p><p>But, the idle is still hanging up! i sat and played with the adjustments for about 10 minutes but to no avail. So, do i have another faulty/worn carb? The concentric looks in very good condition, so i am not really suspecting this.</p><p></p><p>This turned my attention to the 229. I sat at the bench and stripped it (again).. to see if i could work out the issue, if any, with it. I have to be honest, i could not find an awful lot wrong with it? so i set it up on the bench and sprayed some WD40 (its all i had to hand), into the engine side of the slide with the slide fully closed. it actually stayed in the mouth of the carb and did not leak past as i expected a worn carb to do? My initial thoughts are there isn't a lot wrong with the 229, so its going back on, the question is how everyone else sets up the 229 on the bench. A couple of questions;</p><p></p><p>1. Initial set up. The way i see the operation of both carbs is, idle should be achieved with a closed throttle, via the by pass. the throttle slide is set up just off closed, so as long as the needle is set correctly, good, smooth acceleration is achieved. Am i doing this correctly?</p><p></p><p>2. Set up when warm. Initial set up for the idle enrichment screw is 1.5 turns out, then trimmed to achieve the best idle when the engine is warm (best idle for me is highest rpm/smoothest running).</p><p></p><p>Am i doing it wrong?</p><p></p><p>Thanks in advance,</p><p></p><p>Best regards,</p><p></p><p>Steve.</p></blockquote><p></p>
[QUOTE="Steve Morris, post: 122534, member: 3648"] OK, I have an issue with the Comet. The idle hangs up when warm, i posted about this a while ago, and the general consensus was that as i am running the original 229 carb, the carb slide is potentially worn which would cause the hang up. I met with the previous owner at the weekend, and he had found the carb that was on the bike when he used it, an AMAL Concentric. He said the bike was fine on this carb, so yesterday i set about fitting it. No real issues apart from i had to modify the throttle cable slightly but it went on and started pretty well. I have to say at this point i did strip the concentric down before i fitted it and gave it a thorough check over and clean out. Went for a short test ride, and the difference between the concentric and the 229 was minimal, the concentric revs slightly cleaner, but performance is almost identical. But, the idle is still hanging up! i sat and played with the adjustments for about 10 minutes but to no avail. So, do i have another faulty/worn carb? The concentric looks in very good condition, so i am not really suspecting this. This turned my attention to the 229. I sat at the bench and stripped it (again).. to see if i could work out the issue, if any, with it. I have to be honest, i could not find an awful lot wrong with it? so i set it up on the bench and sprayed some WD40 (its all i had to hand), into the engine side of the slide with the slide fully closed. it actually stayed in the mouth of the carb and did not leak past as i expected a worn carb to do? My initial thoughts are there isn't a lot wrong with the 229, so its going back on, the question is how everyone else sets up the 229 on the bench. A couple of questions; 1. Initial set up. The way i see the operation of both carbs is, idle should be achieved with a closed throttle, via the by pass. the throttle slide is set up just off closed, so as long as the needle is set correctly, good, smooth acceleration is achieved. Am i doing this correctly? 2. Set up when warm. Initial set up for the idle enrichment screw is 1.5 turns out, then trimmed to achieve the best idle when the engine is warm (best idle for me is highest rpm/smoothest running). Am i doing it wrong? Thanks in advance, Best regards, Steve. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series 'C' Comet Idle Hanging Up
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