I just got this motor (65273S) and took it out on the little Bayliner Mosquito that it came on. It has a 17P prop on it. With the hammer down, it ran at about 4000 rpm at 28mph, and then occasionally it would bounce up to 5000 rpm and 35mph after running it about 20 minutes. The 2 subsequent times I took it out, it stayed at 28mph. The compression is 138,135,128 and the spark jumps 7/16" on all three. I pulled the carbs apart and cleaned them out after the first run. Also, I replaced the impeller, fuel pump, and gear oil(type C). I revisited the carbs to make sure that the needle valves weren't sticking.
What is the timing advance supposed to be? The difference between idle and fully advanced is literally about 3/8" of movement. Seems like nothing compared to others.
Oddly, my first outboard was a 1973 Johnson 65hp and it did the same thing. I never did figure that one out.
Any ideas where to start looking on this one?
What is the timing advance supposed to be? The difference between idle and fully advanced is literally about 3/8" of movement. Seems like nothing compared to others.
Oddly, my first outboard was a 1973 Johnson 65hp and it did the same thing. I never did figure that one out.
Any ideas where to start looking on this one?