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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: 94865" data-attributes="member: 3239"><p>I think there a second challenge to consider if you are using standard magneto and ATD setup. </p><p>Considering the ATD has a fixed amount of advance, if you set it to 34 or 35 degrees at max advance then you are also setting it to give a very late spark at idle or when starting. I believe the static timing was originally 4 degrees btdc which then gives 39 degrees at max advance. If you set to to 35 degrees at max advance then you will be setting the static timing to top dead centre. </p><p>I think a few owners may have done this and then spent ages trying to correct poor starting and irregular idle by forever adjusting the carburettors especially if fitted with Shadow carbs - me included. </p><p>I have now set mine to 3 degrees btdc and it starts easily, idles well and revs fine. </p><p>Chris</p></blockquote><p></p>
[QUOTE="Chris S, post: 94865, member: 3239"] I think there a second challenge to consider if you are using standard magneto and ATD setup. Considering the ATD has a fixed amount of advance, if you set it to 34 or 35 degrees at max advance then you are also setting it to give a very late spark at idle or when starting. I believe the static timing was originally 4 degrees btdc which then gives 39 degrees at max advance. If you set to to 35 degrees at max advance then you will be setting the static timing to top dead centre. I think a few owners may have done this and then spent ages trying to correct poor starting and irregular idle by forever adjusting the carburettors especially if fitted with Shadow carbs - me included. I have now set mine to 3 degrees btdc and it starts easily, idles well and revs fine. Chris [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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