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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Ignition Timing
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[QUOTE="jaguar, post: 786041, member: 19340"] Just looking at the schematic (see my other post on CDI repair) I'd say the basic design of this CDI tends to cause it to advance the spark timing more as revs go up until around 6000 when the timing capacitor doesn't have enough time to discharge completely before the next cycle and the effect is that above 6000 the spark timing starts to retard (or at least stop advancing) which is really needed. So essentially there is a spark "curve" when graphed out. I plan to diagnose the curve and present a graph for all to see. I also plan to change that capacitor and see how it affects the curve. With less capacitance the retard curve should happen sooner than 6000 which may allow me to set the system more advanced for low revs while still having the right timing for high revs. Basically more of a racing curve and less of a foof bike curve. (boy, that term dates me!) Gearloose, tell me if my ideas are on the right track, since you've had a timing light on the system. Yeah, I agree; I've ruined a few pistons by jetting the carb for the sweetest spot. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Ignition Timing
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