1995 Johnson 115hp will only run WOT with primer/choke held in

BrianDeg

Recruit
Joined
Jul 23, 2011
Messages
5
Thank you for your help everyone!

I have a 1995 Four winns jet boat with a 115hp OMC which to my understanding is a 115hp Johnson.

The boat when held at WOT just bogs unless you hold the primer key in and then it accelerates. I pulled the carbs and they are perfectly spotless! Just want to know what direction to go in next??

Thank you
Brian
BrianDegener@gmail.com
 

Borgey401

Petty Officer 2nd Class
Joined
Jun 11, 2011
Messages
155
Re: 1995 Johnson 115hp will only run WOT with primer/choke held in

I am far from an expert but what I would check next would be the fuel pump.
 

lmuss53

Lieutenant Junior Grade
Joined
Sep 9, 2008
Messages
1,227
Re: 1995 Johnson 115hp will only run WOT with primer/choke held in

Pump the ball instead of hitting the primer while it's acting up. If it runs good while pumping the ball, Borgey401 is right on about the fuel pump. There is a rebuild kit for the fuel side of the VRO pump.
 

BrianDeg

Recruit
Joined
Jul 23, 2011
Messages
5
Re: 1995 Johnson 115hp will only run WOT with primer/choke held in

If the fuel pump is bad and has low pressure then even when opening the primer solenoid it shouldnt have more fuel to push through???
 

BrianDeg

Recruit
Joined
Jul 23, 2011
Messages
5
Re: 1995 Johnson 115hp will only run WOT with primer/choke held in

SO I had the boat out yesterday and it ran great after cleaning carbs for about 15 mins of WOT, then it started to develop a misfire. I tried the primer solenoid to see if it was a fuel issue but that only made it worse, when I backed off the throttle a little it would run better. We stopped and checked the plugs which looked okay. Went back out and it ran fins again for 15mins and then it started to misfire but this time it was much worse and eventually led to it stalling and wouldnt restart. Once back on land it did start about 45 mins later.

I think it may be power pack, your thoughts? How do I diagnose?
 

Sixmark

Master Chief Petty Officer
Joined
Jul 11, 2010
Messages
890
Re: 1995 Johnson 115hp will only run WOT with primer/choke held in

Did you take apart the carbs and clean them?
 

BrianDeg

Recruit
Joined
Jul 23, 2011
Messages
5
Re: 1995 Johnson 115hp will only run WOT with primer/choke held in

Yes the carbs have been cleaned and that resolved the fuel issue at WOT.
 
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