Thread: Optimax 150 rough idle

Originally Posted by sliderman

I would pull fuel sample first. Inspect for the presence of water in the fuel. Next I would check to see if the correct spark plugs were installed. If everything passes inspection, I'd jump straight to a compression test before looking any further. (The lower pressure is either related to the gauge being used to test or the pressure regulator. Those pumps are generally work or don't.)

checked the plugs they were the right one also they said the compression was good on all cylinders. Changed the fuel filter and told me it was a milky color fuel in filter but the tank gas was ok.

Took it to bass pro they said diaphragm