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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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<blockquote data-quote="Magnetoman" data-source="post: 95920" data-attributes="member: 2806"><p>For what it's worth, I have my BB and DBD Gold Stars set very near the factory recommended values of 40.5-deg. (actual setting 40.2-deg.) and 39-deg. (actual setting 37.8-deg.), respectively. With 91 octane fuel, the highest available from the pump in my State, if I lug the Catalina going into an uphill curve it will ping unless I retard the timing somewhat (both bikes have manual advance levers). Both bikes came to me pre-built by someone else so I don't know their compression ratios, although the kick starters tell me they're not low. This fall on a ~1200 mile ride in Texas (where the octane may be a bit higher than 91?) there were no apparent issues with the timing. </p><p></p><p>Anyway, I don't know where the recommendation for using less advance with modern fuels comes from, or what data it may be based on but, like Nigel, I find the factory values from 50+ years ago to be just fine. At least for my Gold Stars.</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 95920, member: 2806"] For what it's worth, I have my BB and DBD Gold Stars set very near the factory recommended values of 40.5-deg. (actual setting 40.2-deg.) and 39-deg. (actual setting 37.8-deg.), respectively. With 91 octane fuel, the highest available from the pump in my State, if I lug the Catalina going into an uphill curve it will ping unless I retard the timing somewhat (both bikes have manual advance levers). Both bikes came to me pre-built by someone else so I don't know their compression ratios, although the kick starters tell me they're not low. This fall on a ~1200 mile ride in Texas (where the octane may be a bit higher than 91?) there were no apparent issues with the timing. Anyway, I don't know where the recommendation for using less advance with modern fuels comes from, or what data it may be based on but, like Nigel, I find the factory values from 50+ years ago to be just fine. At least for my Gold Stars. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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