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Canadian Daves JustKDX
Ignition Timing Question (long)
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[QUOTE="canyncarvr, post: 112244, member: 16552"] You are correct in the second instance (you know that..just agreeing with you). They are TIMING marks..not TDC marks. If they WERE TDC marks, they wouldn't do much good for timing..they are too close to what would be TDC to accomplish anything. re: finding TDC. Dial indicators don't do too well. There is too much of a flat spot at the top (and bottom) of the reciprocation motion of the piston to determine exactly where TDC really is. Best way to find it is a positive stop method. Which sounds like what you used with the possible exception of the stop maybe not being real positive. Why would timing at 6k be the same as at idle? It SHOULD retard considerably at higher rpm. The retarding of spark coincides with power valve actuation..if I recall correctly..which doesn't apply to a '91. Point being that spark is retarded in the upper ranges..as rich said: I'd bet you are correct in all your observations..and that the spec is not. Your method AND the documentation of it seem right on the money. And, yes...it IS time to send your carb off to RB Designs! [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Ignition Timing Question (long)
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