86 40hp Johnson occasionally dies at wot

Gantz6

Cadet
Joined
Jul 11, 2019
Messages
24
I’ve had a lot of issues with this motor, timing plate replaced, all new fuel lines and tank, 1 carb replaced, propeller was replaced because it wouldn’t plane with more than one person, hits plane guickly now. Runs great at 5000 rpms at times and sometimes just dies during wot and very hard to start, then can barely make it to dock. Seems to run fine at 4000 rpms because last time out I kept it there out of fear of getting stuck. Any ideas I’m kind of stuck at this point!
 

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Try pumping the primer bulb when it starts to act up, if that helps, sounds like a fuel pump problem. You might also check the high speed jet in the carb bowel. All fuel delivery has to go through that jet, if restricted, you could be running out of fuel at high speed.
 
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