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Canadian Daves JustKDX
Ignition Timing
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[QUOTE="canyncarvr, post: 784583, member: 16552"] re: how one would check such a thing First off, ftr the 'H' 200 is 21º BTDC @ 6000rpm. Most interesting though, is the correlation to piston travel. In the case of the 'H' 200 that figure is 2mm BTDC. First, find TDC. Use the positive stop method for best results. Thread something into the sparkplug hole that will prevent the piston from reaching TDC. Make a mark someplace on the flywheel. It doesn't matter where. Rotate the engine (by hand of course) CCW until the piston stops by virtue of hitting the stop you installed. Mark a spot on the case corresponding to the mark you made on the FW. Now turn the engine the opposite direction until the piston is stopped. Make another mark. The spot smack inbetween the two marks you just made is TDC (I don't have to say between them which way, do I? ;) ) Remove your stop from the sparkplug hole. Install a dial indicator thru the hole. Rotate the piston to the TDC mark you have determined. Zero your dial indicator. Move the engine CW until your dial indicator reads 2mm+ a good bit, reverse direction-CCW (now going the same way the engine runs) until you just reach 2mm. Or just move it thru a piston cycle in the direction of travel. The important thing is to [b]not[/b] find that 2mm mark when the engine is moving backwards. Make another mark. That's where you can expect to see an alignment (your mark on the FW and the 2mm mark on the case) when you attach a timing light. Adjust the stator to suit. You can use a degree wheel to the same end....find TDC the same way. Using a dial indicator to try to 'measure' TDC isn't effective. You will see a lot of rotation happening with the piston barely moving. Used to be a lot easier with points. A meter would tell you when the points opened. You won't see that sort of thing with a magneto. I don't know of a mechanical method to determine spark time with a mag/cdi setup. That's what you need a timing light for. Well...and a tach. Unless you have an RPM sensitive ear? ;) An o'scope will work...look for 167usec cycle. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Ignition Timing
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