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General Minitrail Talk
Modifications
Tuning CT70s for street use
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<blockquote data-quote="Grant's trail" data-source="post: 57600" data-attributes="member: 2807"><p>Sorry if it didn't make since, I meant set the timing about .125 to .200 further advanced then the stock firing mark on the flywheel and see how it runs. By opening the point gap a little the points break sooner and advance the timing. to the point that the coil doesn;t have enough time to build up for the next spark. but the small amount were talking about is if you have a larger cam and more compresion you might see a little more power from your combo. I use a 12v timing light hooked up to a seprate battery with the clip on the sparkplug wire, then with the engine running shine it on the timing marks. As the point block wears down your timing slows and you loose performance. With a little math if you measure the flywheel, that X Py or 3.1416 close enough take that number divide it by 360 that gives you how far the flywheel turns to travel 1 degree, now X that number by 40 for total degrees when runing and that number if you measure from top dead center mark forward</p><p> with a scale or tape wraped around the flywheel is were your total timing should be when the eng is rev-up. 40 degrees is a base number it might work a couple deg better forward or back but the automatic bike total timing is a lot less then this. you have to watch for it to kick back though when you kick start it.</p></blockquote><p></p>
[QUOTE="Grant's trail, post: 57600, member: 2807"] Sorry if it didn't make since, I meant set the timing about .125 to .200 further advanced then the stock firing mark on the flywheel and see how it runs. By opening the point gap a little the points break sooner and advance the timing. to the point that the coil doesn;t have enough time to build up for the next spark. but the small amount were talking about is if you have a larger cam and more compresion you might see a little more power from your combo. I use a 12v timing light hooked up to a seprate battery with the clip on the sparkplug wire, then with the engine running shine it on the timing marks. As the point block wears down your timing slows and you loose performance. With a little math if you measure the flywheel, that X Py or 3.1416 close enough take that number divide it by 360 that gives you how far the flywheel turns to travel 1 degree, now X that number by 40 for total degrees when runing and that number if you measure from top dead center mark forward with a scale or tape wraped around the flywheel is were your total timing should be when the eng is rev-up. 40 degrees is a base number it might work a couple deg better forward or back but the automatic bike total timing is a lot less then this. you have to watch for it to kick back though when you kick start it. [/QUOTE]
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Tuning CT70s for street use
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