40 hp yamaha electical problem

[spark plug]

I have a 40 hp yamaha, and only one cyl. will fire. I have checked the plugs. Is the coil bad, or the power pack. Please reply

 

[rodbolt]

Re: 40 hp yamaha electical problem

hello<br /> with no model number or at least a year and how many cylinders its can be anything from a pulser coil to a loose nut behind the helm. post back more info and we can try to help<br />good luck and keep posting