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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing of electronic ignition
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<blockquote data-quote="Pete Appleton" data-source="post: 3208" data-attributes="member: 145"><p><strong>Breaking starter clutches</strong></p><p></p><p></p><p></p><p>I believe that the thing that is breaking starter clutches with electronic ignition systems is an effect that I first noticed when I fitted a Boyer system to my Triton. High compression pistons, Wide-line frame, Clip-ons and no decompressor does not lead to a comfortable starting position. When you try to ease the engine up to & over compression, in order to be ready for a full kick, it will suddenly fire just before TDC and launch you out of the saddle.</p><p>This is due to the inability of most electronic systems to advance! They can only retard. When setting up the Boyer (and many others) you set the pickup pulse to occur at the point where you want maximum advance to be, in the case ot the Triton 40 degrees BTDC. At intermediate engine speeds the unit waits for the pickup pulse and then calculates the delay time to wait before sparking, based on engine speed. e.g. at 1000 RPM if you want 15 degrees advance you must wait 25 degrees worth of time from the pickup point. </p><p>With the engine being turned over at an irregular speed, either by me on a kickstart or by an electric motor, then this delay time cannot be accurate. Hence if you ease the engine past the pickup point then stop you get an enormous kickback and I suspect the same thing wrecks the starter. The answer to this is to either mechanically retard the pickup point as M Grosset has done or use a second pickup at TDC for starting purposes.</p><p></p><p>I hope this all means something</p><p>Pete</p></blockquote><p></p>
[QUOTE="Pete Appleton, post: 3208, member: 145"] [b]Breaking starter clutches[/b] I believe that the thing that is breaking starter clutches with electronic ignition systems is an effect that I first noticed when I fitted a Boyer system to my Triton. High compression pistons, Wide-line frame, Clip-ons and no decompressor does not lead to a comfortable starting position. When you try to ease the engine up to & over compression, in order to be ready for a full kick, it will suddenly fire just before TDC and launch you out of the saddle. This is due to the inability of most electronic systems to advance! They can only retard. When setting up the Boyer (and many others) you set the pickup pulse to occur at the point where you want maximum advance to be, in the case ot the Triton 40 degrees BTDC. At intermediate engine speeds the unit waits for the pickup pulse and then calculates the delay time to wait before sparking, based on engine speed. e.g. at 1000 RPM if you want 15 degrees advance you must wait 25 degrees worth of time from the pickup point. With the engine being turned over at an irregular speed, either by me on a kickstart or by an electric motor, then this delay time cannot be accurate. Hence if you ease the engine past the pickup point then stop you get an enormous kickback and I suspect the same thing wrecks the starter. The answer to this is to either mechanically retard the pickup point as M Grosset has done or use a second pickup at TDC for starting purposes. I hope this all means something Pete [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing of electronic ignition
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