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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Egli 500 Special Carburation
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<blockquote data-quote="greg brillus" data-source="post: 98730" data-attributes="member: 597"><p>The bloke at BTH hasn't got a clue, He told me half the mag's he sells are twin spark, and no one has any problems. That must mean there are a lot of bikes that are not used. You can not run a twin spark ignition that has the same advance curve as a single spark set up, the range of ignition will be too much. A stock BTH you set up will have 4 degrees retard and 34 degrees full advance. On a twin spark, the full advance needs to be 28 at the most probably less, so the retarded position is 2 degrees after TDC this will make the engine hard to start. The only way this would work is if you had a fixed timing BTH and used an original ATD with the travel reduced to 12 to 14 degrees of movement. You will need to check the ignition timing to see what you have, but the easiest and cheapest fix is to run it as a single plug. I have done exactly this to a 600 Comet engine here that has a twin spark BTH now only running one plug, ignition set at 34 degrees, engine starts very well.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 98730, member: 597"] The bloke at BTH hasn't got a clue, He told me half the mag's he sells are twin spark, and no one has any problems. That must mean there are a lot of bikes that are not used. You can not run a twin spark ignition that has the same advance curve as a single spark set up, the range of ignition will be too much. A stock BTH you set up will have 4 degrees retard and 34 degrees full advance. On a twin spark, the full advance needs to be 28 at the most probably less, so the retarded position is 2 degrees after TDC this will make the engine hard to start. The only way this would work is if you had a fixed timing BTH and used an original ATD with the travel reduced to 12 to 14 degrees of movement. You will need to check the ignition timing to see what you have, but the easiest and cheapest fix is to run it as a single plug. I have done exactly this to a 600 Comet engine here that has a twin spark BTH now only running one plug, ignition set at 34 degrees, engine starts very well. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Egli 500 Special Carburation
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