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chadburgess2003

Yamaha bigbear no spark

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Ok so I have a Yamaha big bear that will not spark a lick. Ive checked everything I know to check on this thing can cant locate the problem. The only way I can get it to start and run is to jump the two back wires coming off the key switch theres 4 wires on the key switch. If I jump them two it will start and run great but it will not die when I turn the switch off the only way I can kill the motor is to turn the engine stop/run switch off. If it was mine id run the heck out of it that way but its a older friend of mine and I would rather have the key switch operating correctly. I have already replaced the key switch with 2 different switches and it does the same thing. I have also replaced the cdi and still has not changed anything. I would highly appreciate any advise I am at a lost on this thing. thanks

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What year is your Yamaha ATV? Doesn't sound like a spark issue but more like an ignition switch issue, which you said you replaced, right? Are the wires on correctly? Is there any external accessories wired to the ignition circuit?

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What color are your wires? red should be batt hot, brown is connected to the brown for power with the key on, the black and black with white tracer typically connected to kill it. IIRC. They had a mid-year change, and I had a heck of a time figuring the problem - even had a new OEM ignition switch.

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