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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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<blockquote data-quote="greg brillus" data-source="post: 80780" data-attributes="member: 597"><p>Sorry, Been in engines and removed from further service............But see how you go, maybe you might be more lucky than me. If you set you ignition to 34 degrees full advance you should be fine, as modern fuels burn faster then less timing is needed. You might need also to adjust the stops on your ATD so you don't have as much total range, simply bend all four stops in a bit. The original range of a stock ATD is about 17 degrees, giving 34 crank degrees..........So 5 degrees in the retarded position plus 34 in the ATD = 39 degrees overall advance, but this is way too much nowadays. You still need the retarded ignition to be around 4 or 5 degrees BTDC or else the engine will run hot and maybe hard to start, but you want the overall advanced ignition no more than 34 degrees so this is why you need to reduce the travel range of the ATD from 17 back to 15 degrees of travel. Also when looking at the points end of the magneto the ramp on the camring that opens the points at the bottom when mounted on the engine is the number one(1) firing position counterclockwise rotation from this end of the mag, number one pickup at the rear of the mag closest to the front cylinder, remember number one cylinder is the REAR cylinder. Cheers and good luck.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 80780, member: 597"] Sorry, Been in engines and removed from further service............But see how you go, maybe you might be more lucky than me. If you set you ignition to 34 degrees full advance you should be fine, as modern fuels burn faster then less timing is needed. You might need also to adjust the stops on your ATD so you don't have as much total range, simply bend all four stops in a bit. The original range of a stock ATD is about 17 degrees, giving 34 crank degrees..........So 5 degrees in the retarded position plus 34 in the ATD = 39 degrees overall advance, but this is way too much nowadays. You still need the retarded ignition to be around 4 or 5 degrees BTDC or else the engine will run hot and maybe hard to start, but you want the overall advanced ignition no more than 34 degrees so this is why you need to reduce the travel range of the ATD from 17 back to 15 degrees of travel. Also when looking at the points end of the magneto the ramp on the camring that opens the points at the bottom when mounted on the engine is the number one(1) firing position counterclockwise rotation from this end of the mag, number one pickup at the rear of the mag closest to the front cylinder, remember number one cylinder is the REAR cylinder. Cheers and good luck. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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