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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Amal MK1 Concentric
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<blockquote data-quote="greg brillus" data-source="post: 111284" data-attributes="member: 597"><p>Detonation is equally ignition timing and fuel mixture. A single works pretty hard compared to a twin, so a mixture strength on the rich side is more desirable than too weak. Have you tried a number 3 slide, may be worth a try. The cutaway affects a large range of throttle, mostly from idle up to 3/4. I often modify slides to somewhere between say a 3 and a 3 1/2 to get a better mixture..........although we find plug readings difficult with modern fuels, you can still get some idea of a colour that shows either too rich (very sooty) or too lean where the electrodes look too clean. It can be a challenge to get right as you have found yourself.........</p></blockquote><p></p>
[QUOTE="greg brillus, post: 111284, member: 597"] Detonation is equally ignition timing and fuel mixture. A single works pretty hard compared to a twin, so a mixture strength on the rich side is more desirable than too weak. Have you tried a number 3 slide, may be worth a try. The cutaway affects a large range of throttle, mostly from idle up to 3/4. I often modify slides to somewhere between say a 3 and a 3 1/2 to get a better mixture..........although we find plug readings difficult with modern fuels, you can still get some idea of a colour that shows either too rich (very sooty) or too lean where the electrodes look too clean. It can be a challenge to get right as you have found yourself......... [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Amal MK1 Concentric
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