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I just picked up a 48SPL from a guy who says he bought it from his neighbor who had it on a pontoon boat. I put it on my 16' Grumman. I took it to my mechanic who serviced it and cleaned the carburetors. Otherwise, it checked out fine. When I first ran it, it powered up fine but it would start to cut out and seem to starve for fuel when I pushed the throttle full. My mechanic took the fly wheel off and found the coil was leaking and the ingnition was damaged. He then installed a power pack conversion kit, new coils and again adjusted the carburetors. It no loner surges but runs rough and will not achieve high rpms. I am at a loss. The only thing that occurred to me is that, since it came off a pontoon boat, perhaps the prop pitch is not enough and it is peaking out rpm at a slow speed. I don't have a tach so I don't really know how many rpms it is at when it starts to break down. Anybody had a similar problem or got any ideas?
Bob
Believe it or not, the problem was the prop! Since the engine had been used on a pontoon boat, the pitch of the prop was 11. I first tried a 15 degree pitch and the problem was siginificantly better. I then changed it to a 17 degree prop and the problem was comepletely solved. Not enough resistance on a two stroke engine will prevent it from running smoothly. Lesson learned.
Bob
Believe it or not, the problem was the prop! Since the engine had been used on a pontoon boat, the pitch of the prop was 11. I first tried a 15 degree pitch and the problem was siginificantly better. I then changed it to a 17 degree prop and the problem was comepletely solved. Not enough resistance on a two stroke engine will prevent it from running smoothly. Lesson learned.
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