88 johnson won't reach WOT

papaz

Cadet
Joined
Feb 26, 2010
Messages
15
Got a '96 Johnson 88 on my pontoon and the last time I took it out it would not reach wot. It would only go to 36 to 3800 rpm. I removed each plug wire and cranked the engine one at a time to verify everything was firing, replaced the plugs. I also tried hitting the electric choke for small bursts while underway and it made no difference. I can throttle back just a little from wide open and it will occasionally surge to 4000 to 4200, it almost feels like the throttle is not opening like it should. I will replace the fuel filter today, any other suggestions, i'm at a loss!!
 

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,392
Re: 88 johnson won't reach WOT

Pump the primer bulb and see if it helps. You really need to do a proper spark test with a spark tester.
 

papaz

Cadet
Joined
Feb 26, 2010
Messages
15
Re: 88 johnson won't reach WOT

I pumped the primer bulb while underway too, actually have 2 tanks with a switch so I changed tanks and pumped that one also with the same results.
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 88 johnson won't reach WOT

suggest cleaning the carbs.
 
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