1986 15hp johnson wont stay running at full throttle

goosman

Recruit
Joined
Jun 1, 2010
Messages
1
once I bring my motor up to full throttle it will maintain full rpm for about ten seconds and then slowly idle down. I have noticed that I lose full pressure and if I pump the primer bulb while running the motor at full throttle it will maintain its full power. it idles and runs great up to about half throttle but once I open it up to full throttle it doesnt want to stay there. Can anyway suggest what might be wrong or where I should start to look first?

Thank for your inputs.
 
D

DJ

Guest
Re: 1986 15hp johnson wont stay running at full throttle

Does the primer bulb collapse? If so, I'd be looking at the tank vent.

If not, I would be looking at the fuel pump.
 
Top