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NateDiggity

Kazuma 50, Trying to get spark HELP

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I have a buddy who bought this bike, had his nephew put about 4 hours on it, then it sat outside for 2 years.

He gave me the bike, the rear brakes were rusted frozen. Got those free and ran the bike around a few laps around the yard and it died. It ran well when it was going.

I now have no spark. I thought it could be the stator as the stator and flywheel had some rust on them, so replaced the stator, and cleaned off the flywheel but I still have no spark.

I am leaning towards coil or cdi now. Rather than throw more money at it, is there a way to test the cdi output to the coil? The coil has a black/yellow wire and a green wire. Green seems to be ground throughout the bike so Im assuming the black wire from the cdi to the coil is the 'hot' wire... Does anyone know what kind of voltage this black/yellow wire is suppose to have when cranking? If I knew that I could tell if the cdi was working correctly and it was the coil faulty or vice versa....

Anyone have this information?

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There is a direct resistance test that you can perform on the coil, if you get a repair manual, the test procedures and specs should be in there. Testing a CDI can be a crapshoot, they can be tested, but just because it tests good doesn't mean that it is good. On the other hand, if it does test bad, then it is most likely bad. I would just google CDI test and do some research on that. One other thing to check is the connection between the spark plug boot and coil wire, the boot should just unscrew from the wire, make sure there is good clean wire at the the end for the boot screw to connect to, if you need, you can clip a small amount of the rubber insulation back until you see good wire. Also, have you tried a new plug? What year is the machine?

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