Okay... I understand your explanation of the switching sides and message thing... appreciate that. You got to admit it did sound a little weird.
ignition coil,distributer cap,check purple coil wires.... best guess ignition related
Thanks for the help
The complete engine ID is needed. It will begin with the number 6. One the side of the motor, on the decal, right below the model identity.
Under what operating conditions?
Is it temperature related or oil pressure related? What is your Yamaha tachometer telling you?