Intermittent power on 15hp 2-stroke

[easyvictor]

I've got a Johnson 15hp 2-stroke, model J15REEA. Sometimes I can get full power (you can feel the difference), but most of the time it's kind of weak and you can hear it almost sputtering at WOT.

I did some experimenting and found that if I do a hard left turn, where everything in the boat shifts to the right, I can get full power! Then if I do a right turn, it seems weaker. Straight forward is somewhere in between.

I'm thinking it has to do something with not enough fuel making it into the cylinders, and the right/left thing could relate to fuel sloshing in the carburetor bowl? Is this a simple issue of fuel starvation, or more complex like adjusting the carb float? I've got the shop service manual but am no expert with 2-stroke engines.

Any thoughts would be useful.

 

[Daviet]

You might check the high speed jet in the bottom of the carb bowl, all fuel has to pass through it. Maybe it is restricted.

 

[oldboat1]

Electrical, maybe. Check under flywheel for binding wires; Check all connectors and boots.