I would check connections on the heavy-guage wires to and from your battery and to and from (if one exists) the starter motor on the engine. It sounds like power is getting to the low amp circuits, but not the starter motor.
Have you owned this ATV for a while and know its repair history?
The next thing you can do to troubleshoot the problem is to use a battery jumper cable to test connections, but be careful when doing this because it will by-pass some safety features of the machine. Always make sure the ATV is in neutral and the parking brake is set when working on ATV starting problems. In this case, you could leave the ignition "off" so the engine turns over, but doesn't start. Also, be careful when working around the high current circuit of your ATV. When using jumper cables, make sure you're insulated from the electricity and anticipate some arcing.
1. I would use a jumper cable to momentarily connect the two heavy-guage terminals on the starter relay. If it cranks, then it's very likely your starter relay is faulty. If it doesn't crank, then you have a faulty starter or bad connection.
2. Use a jumper cable to connect an unpainted part of the engine to the negative battery terminal then try to start the ATV normally. If this starts the engine, your engine or battery is not adequatly grounded.
3. Use a jumper cable to directly connect your battery's positive terminal to the starter motor terminal. If this cranks the engine, you have a bad connection between the battery and starter (assuming you already stried #1 above).
If you still don't get the engine to crank after those three steps, your starter is probably faulty, unless the battery is in very poor condition.
Good luck!
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2004 Yamaha YFZ450
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Linear Mode
