Have Boat Questions? Ask a Boat Repair Expert.
Hello Bryan. My name is Tan.
What you need to do is to run the boat up to full throttle and squeeze the [primer bulb does it run better? If no change then we need to check spark on all cylinders at full throttle. This is done with the use of a timing light. Connect the light to each cylinder and run the boat. Watch the flash of the timing light it should be steady with no dead spots. If you find a misfire swap that cylinders coil with a known good firing coil. Does the misfire move or stay?
Can you do these tests and post back with findings?
Ok that's fine keep me posted.