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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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<blockquote data-quote="Chris S" data-source="post: 94873" data-attributes="member: 3239"><p>Peter - I replaced the ATD springs to ensure the bob weights were a: pulling back in correctly at low revs and b: controlling the outward movement of the weights to attempt to keep the advance curve correct.</p><p>I agree that an ATD is a fairly crude device, but they crop up all over the place in ignition control systems and have done for a very long time and when operating normally give a consistent reliable ignition advance. Arguably, at least you can see and feel if they appear to be operating correctly unlike an electronic unit which needs a lot more kit to check. </p><p></p><p>You are probably correct that some people will be covering up an ATD that is not functioning properly by altering the timing. However, a lot of owners do report better high speed running at 35 degrees. If using the ATD setup then the advance of the ATD should be restricted to stop a 35 degrees thereby keeping the low speed timing correct rather than simply retarding the whole curve, ending up with retarded low speed timing as per my earlier post.</p><p></p><p>Chris</p></blockquote><p></p>
[QUOTE="Chris S, post: 94873, member: 3239"] Peter - I replaced the ATD springs to ensure the bob weights were a: pulling back in correctly at low revs and b: controlling the outward movement of the weights to attempt to keep the advance curve correct. I agree that an ATD is a fairly crude device, but they crop up all over the place in ignition control systems and have done for a very long time and when operating normally give a consistent reliable ignition advance. Arguably, at least you can see and feel if they appear to be operating correctly unlike an electronic unit which needs a lot more kit to check. You are probably correct that some people will be covering up an ATD that is not functioning properly by altering the timing. However, a lot of owners do report better high speed running at 35 degrees. If using the ATD setup then the advance of the ATD should be restricted to stop a 35 degrees thereby keeping the low speed timing correct rather than simply retarding the whole curve, ending up with retarded low speed timing as per my earlier post. Chris [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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