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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
KX125 97 fRIGGIN JUNK! ergg...need help
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[QUOTE="Colorado, post: 991308, member: 60368"] A thought just occured to me. I've never had this isssue on one of my bikes, so don't know if your symptoms match up. But a two-stroke requires primary compression in the crankcase which creates a slight vacuum in order to pull the fuel mix in durring the compression stroke. If mix (or enough mix) isn't pulled down, it won't be there to move up into the combustion chamber through the transfer ports. The vacuum is created on the upstroke, then as the piston moves down and closes the intake port, pressure builds to push the mixture into the combustion chamber. Like I said, I haven't had the problem, but know that it is sometimes a diagnostic nightmare because everything else seems fine, but a bike just won't run right. A bad cylinder base seal, crank seal, or cracked crankcase casting can all result in this problem. To test it you remove the pipe and carb, then seal the openings and pressurize the crankcase with air. If it holds air it's fine, if not you just have to locate the leak and seal it. The rub is that you need special tools to seal and pressurize the crankcase, but you can make them yourself. I remember reading a thread here at DR a few months ago where one of the members described his fabricated setup and posted a picture. It would have been here in General Repair, in Vintage, or in Canadian Dave's KDX forum because those are the ones I read. You can try searching for it, or might want to start new threads asking about primary compression testing, equipment and symptoms. [/QUOTE]
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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
KX125 97 fRIGGIN JUNK! ergg...need help
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