Weasel tooth
New member
I have a 15 hp evinrude that I believe is post 93 that is giving me fits!! when the engine is cold, it will run full out with good power but once she warms up it will bog out at WOT.
After warming up good, it will idle and start and do lower rpm just fine but it just chugs if you try to give it more than about half throttle, now when I say chug, I don't mean it tries to die, it just stops accelerating past about half or so and I can hear a difference in engine sound if I rotate the throttle past where it stops doing any good.
I am at a total loss here, have had this motor for years and it always ran like a top, still always starts great just wont make good power after it warms up.
I have replaced the coil, plugs, fuel line, and tank, and you could eat cheerios out of the carb it is so clean, just stumped. Compression is 90psi on both cylinders.
The plugs don't look super wet and greasy like it is flooding from bad float seat and the bowl seems to stay full even when its running bad so I don't think its the fuel pump not keeping up, I put an in-line spark light on it today and couldn't tell any difference in spark from -cold start running good- to -warmed up no WOT.
If I try to choke it a little when it stops making power at wot it kills it really fast,
and my experience (which isn't a whole lot) with cdi boxes is that they either work or they don't.
I read a post where someone had similar problems and someone suggested that it was overheating and starting to seize but do not think that is the problem as I can hold my hand on the water jacket after running it for a while, and it is "peeing" good. That being said, I have never changed the impeller in the eight or ten years I have had it and it is likely due but don't think that's it.
Am I missing something obvious? Any help or suggestions would be greatly appreciated, I don't want to start throwing parts at it and hoping but that is about where I am at this point,
Lets just say if I had hair I would be pulling it out!
After warming up good, it will idle and start and do lower rpm just fine but it just chugs if you try to give it more than about half throttle, now when I say chug, I don't mean it tries to die, it just stops accelerating past about half or so and I can hear a difference in engine sound if I rotate the throttle past where it stops doing any good.
I am at a total loss here, have had this motor for years and it always ran like a top, still always starts great just wont make good power after it warms up.
I have replaced the coil, plugs, fuel line, and tank, and you could eat cheerios out of the carb it is so clean, just stumped. Compression is 90psi on both cylinders.
The plugs don't look super wet and greasy like it is flooding from bad float seat and the bowl seems to stay full even when its running bad so I don't think its the fuel pump not keeping up, I put an in-line spark light on it today and couldn't tell any difference in spark from -cold start running good- to -warmed up no WOT.
If I try to choke it a little when it stops making power at wot it kills it really fast,
and my experience (which isn't a whole lot) with cdi boxes is that they either work or they don't.
I read a post where someone had similar problems and someone suggested that it was overheating and starting to seize but do not think that is the problem as I can hold my hand on the water jacket after running it for a while, and it is "peeing" good. That being said, I have never changed the impeller in the eight or ten years I have had it and it is likely due but don't think that's it.
Am I missing something obvious? Any help or suggestions would be greatly appreciated, I don't want to start throwing parts at it and hoping but that is about where I am at this point,
Lets just say if I had hair I would be pulling it out!
