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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
600cc Comet Carbie?
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<blockquote data-quote="Black Flash" data-source="post: 77575" data-attributes="member: 433"><p>I have no experience with late timing on starting on a motorcycle. </p><p>In fact I have no idea when my ignition will fire while starting the bike. </p><p>I do know from my programmable ECU of my 5 litre TVR with a very racy cam that we start the engine actually at 2 degrees ATDC. Also at idle the engine is well retarded which eases off the extremely lumpy running with the semi racecam. </p><p>I doubt that the timing Harry is using will make his bike a non starter. If you look at the actual piston motion at - 5 to +5 degrees around TDC in my belief the firing point is not very important to start the engine. After the first few revolutions the engine will speed up and the ignition advance will start. </p><p>I tend to think that the spark may not be strong enough. Or it could be the plugs, the carb settings, obstruction in the idle circuit or a problem with the BTH. </p><p>From all the starting problems I had till now it was never the timing 80% of the problems were carb related 20% plugs. </p><p>But maybe I was just lucky</p><p>Bernd</p></blockquote><p></p>
[QUOTE="Black Flash, post: 77575, member: 433"] I have no experience with late timing on starting on a motorcycle. In fact I have no idea when my ignition will fire while starting the bike. I do know from my programmable ECU of my 5 litre TVR with a very racy cam that we start the engine actually at 2 degrees ATDC. Also at idle the engine is well retarded which eases off the extremely lumpy running with the semi racecam. I doubt that the timing Harry is using will make his bike a non starter. If you look at the actual piston motion at - 5 to +5 degrees around TDC in my belief the firing point is not very important to start the engine. After the first few revolutions the engine will speed up and the ignition advance will start. I tend to think that the spark may not be strong enough. Or it could be the plugs, the carb settings, obstruction in the idle circuit or a problem with the BTH. From all the starting problems I had till now it was never the timing 80% of the problems were carb related 20% plugs. But maybe I was just lucky Bernd [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
600cc Comet Carbie?
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