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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: 98608" data-attributes="member: 597"><p>I think he has a newer model BTH on there, which as a twin spark magneto will not work. The advance range is the same as a single spark version. If you have the timing set right for twin plug operation, the retarded position will be too far retarded. This for one will definitely make it hard to start, but if you advance the timing for better starting the engine will detonate. My advice Ben is to disconnect one of the spark plugs, and disconnect the small coil that runs that plug. Either tape up or simply chop off the extra blue and brown wires, they are in parallel to the other coils wires, so no big deal. This way you can run it at say 34 to 35 degrees full advance, the retarded position will be better for starting, and you will not suffer any detonation. The low speed/part throttle performance is in the slide cut away, if it is too small the engine will run rich and vice versa is it is too large. You can buy slides with different cut away sizes, I modify my own. But the ignition is the best place for you to start, for ease of starting and perhaps part throttle behavior as well. Cheers...........Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 98608, member: 597"] I think he has a newer model BTH on there, which as a twin spark magneto will not work. The advance range is the same as a single spark version. If you have the timing set right for twin plug operation, the retarded position will be too far retarded. This for one will definitely make it hard to start, but if you advance the timing for better starting the engine will detonate. My advice Ben is to disconnect one of the spark plugs, and disconnect the small coil that runs that plug. Either tape up or simply chop off the extra blue and brown wires, they are in parallel to the other coils wires, so no big deal. This way you can run it at say 34 to 35 degrees full advance, the retarded position will be better for starting, and you will not suffer any detonation. The low speed/part throttle performance is in the slide cut away, if it is too small the engine will run rich and vice versa is it is too large. You can buy slides with different cut away sizes, I modify my own. But the ignition is the best place for you to start, for ease of starting and perhaps part throttle behavior as well. Cheers...........Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Egli 500 Special Carburation
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