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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: 111272" data-attributes="member: 597"><p>Martyn needs to look elsewhere, changing the main jet size is only going to save an engine on constant full throttle...........I would be looking at the slide cut away and the needle position to enrichen the mixture at more constant part and mid throttle settings. Retarding the ignition is not the answer either, as you are retarding it over the whole range, especially down in the lower rev range where a retarded ignition will make the engine run hotter. As Bill knows, sometimes a change in slide numbers is too much or too little, so a 3 might run rich and a 4 is too lean........It is quite easy to modify the slides several times to make changes without destroying the slide all together.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 111272, member: 597"] Martyn needs to look elsewhere, changing the main jet size is only going to save an engine on constant full throttle...........I would be looking at the slide cut away and the needle position to enrichen the mixture at more constant part and mid throttle settings. Retarding the ignition is not the answer either, as you are retarding it over the whole range, especially down in the lower rev range where a retarded ignition will make the engine run hotter. As Bill knows, sometimes a change in slide numbers is too much or too little, so a 3 might run rich and a 4 is too lean........It is quite easy to modify the slides several times to make changes without destroying the slide all together. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Amal MK1 Concentric
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