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2004 Yamaha 150 2 stroke runability problem, help!

S

Snakeriversailor77

Contributing Member
Does V6 2 stroke have a low and high speed winding on the stator? Motor keeps cutting out about 3000 rpm under load. Has no spark to #6 cylinder, coil not sparking. Swapped coil, no change. Changed fuel, filters, fuel pump, no change. Pulser coil? Why only one dead col? Not two? Stator, high speed winding? Help
 
Maybe you have a bad plug? bad wire? Don't think so. I swapped out the coil with another cylinder, the other cylinder with the #6 coil fired fine on the "new" cylinder but #6 still didn't. Changed plugs too, no change, still no fire on #6. Changed the CPS and the pulser coil, #6 fires now. Still seems to be in rpm reduction no more than 3000 rpm.
 
Thanks all for the help. I solved both of the problems the engine seemed to be having. Replacing the pulse coil gave spark back to #6 and a new stator solved the runnability problem. Gets up and goes now.
 
An update, the engine worked great for two test runs and about an additional 20 minutes before acting up again, back to limited rpm at 3000. Checked sync and link appeared either on or close. Idle seems too slow and will stall now. Observe the only way for the engine to start is to engage the choke. Yamaha master tech suggested a intermittant cdi problem. Owner doesnt want to pay for more parts and feels the other expensive parts didnt solve anything.
 
Is there spark on all the holes? If yes, Pull the carbs. Clean them well. Roll up some emery cloth and sand out the float seats on the carb bodies.

I have only changes a stator on a Yamaha two times in 20 years.
 
You are checking for a spark with a spark tester and not just looking for bunt fuel deposits . On my 2004 I had a bad fuel injector ,the plug was nice and clean . Not getting fuel but getting a spark.
 
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