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Louie
Louie, Technician
Category: Motorcycle
Satisfied Customers: 11433
Experience:  25+ yrs. experience
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I HAVE a 1986 Yamaha yfm225 atv with with a no start condition.

Customer Question

I HAVE a 1986 Yamaha yfm225 atv with with a no start condition. Have replaced the cdi and coil with no help. Question #1 When should I have battery voltage on the orange coil wire---Any suggestions appreciated. Bill
Submitted: 1 year ago.
Category: Motorcycle
Expert:  Louie replied 1 year ago.
Hi and welcome to JustAnswer,

Thank you for the question and your patience. Should you still need assistance for information purposes only...

Initially and on "...
When should I have battery voltage on the orange coil wire..."; none. This wire should have a pulsating voltage when attempting to start or with the engine running and not consistent 12V.

Still, a review / proposed preliminary checks with the use of a multi-meter (if have not been done):
  • • Engine RUN/OFF Switch is disengaging correctly;
  • • when attempting to start or with engine cranking or running;
  • - pulsating low voltage between the 2 white/red wires wires from the pickup coil to the CDI;
  • - pulsating high voltage between the brown wire and engine ground from the stator exciter (capacitor) coil to the CDI;
  • - pulsating voltage on the orange wire from the CDI to the ignition coil;
  • - ensure that the black/white wires are not tied to the engine ground.

Please post back results / observations of the above once tried.