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post #1 of (permalink) Old 11-07-2008, 06:08 PM
QuadSquad
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Yamaha yfz problem

I have a Yamaha 2005 yfz 450.The problem I am having is I have bought a new battery,and with in 2 hours of riding the battery is dead.This is what happened to the the other old battery,so i am sure it not the battery.Since I have owned the quad I have noticed that when I turn the headlights on they flicker with the motor,if I rev the motor the headlights get brighter.Does anybody know what the problem is.Stator,ignition coil
Thank you for any suggestions,
Brian
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post #2 of (permalink) Old 11-09-2008, 06:09 PM
 
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there are only two mechanical contitions that can cause this, one could be a faulty charging coil(in the stator assembly) or a bad regulator/rectifier. Assuming that all electrical conection are good. To test this you can measure ac voltage prior to the reg/rec conection. if the voltage rises with engine rpms then the culprit is the regulator. The only way to test the regulator is to replace it with a known good unit.
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