I used to have a 2001 225 pos66. About every 20 hours, I would have to put a torch to the O2 sensor and it would run better. It would also shudder when getting up on plane and switching to six cylinders. I don't remember at what rpm that was.
I happened to be at my mechanic's place when the factory rep was there and he offered to go on a test ride. He determined that I would benefit from a prop of less pitch (19" to 17") and he swapped it out for me. It helped, but I never did like the way it idled and at slow speed.
|