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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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<blockquote data-quote="greg brillus" data-source="post: 94742" data-attributes="member: 597"><p>Old style combustion chambers.............Hemispherical..........Plus don't forget the effects from an air cooled engine, where temperatures change far more than liquid cooled engines. Most old school engines which are set up at their original full advance will detonate quite badly. It affects carburretion as well, number 4 slides in original 229/289 carb's are almost too lean on modern fuels. It is possible that the specific gravity of modern fuel could have an affect as well. We are finding here in Australia that the thinking of running these bikes on "Premium" fuel that is 98 octane is not so successful on account of that the top end "part" of the fuel evaporates/boils off too quickly and leaves a fuel not unlike kerosene in the tank. Most here are running standard 91 octane unleaded fuels. The 98 octane fuels are suitable for modern fuel injected hi compression liquid cooled cars and bikes.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 94742, member: 597"] Old style combustion chambers.............Hemispherical..........Plus don't forget the effects from an air cooled engine, where temperatures change far more than liquid cooled engines. Most old school engines which are set up at their original full advance will detonate quite badly. It affects carburretion as well, number 4 slides in original 229/289 carb's are almost too lean on modern fuels. It is possible that the specific gravity of modern fuel could have an affect as well. We are finding here in Australia that the thinking of running these bikes on "Premium" fuel that is 98 octane is not so successful on account of that the top end "part" of the fuel evaporates/boils off too quickly and leaves a fuel not unlike kerosene in the tank. Most here are running standard 91 octane unleaded fuels. The 98 octane fuels are suitable for modern fuel injected hi compression liquid cooled cars and bikes. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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