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Johnson 48 hp spl not running at full speed

J

j_seward

New member
"I took my boat out and it was

"I took my boat out and it was running very good then it slowed down (bogged) and then a few min. later it came out of it. I took it back out last night and then it would never get up to speed. However, it idles great, just no power on the high end. Can anyone help me on a fix? Thanks!"
 
"have you tried pumping the pr

"have you tried pumping the primer bulb while underway?

are you runnin a water seperater or just a fuel filter?

also check your spark, should jump a 7/16 gap, and check your compression the cyls should be within 10% of each other."
 
I tried pumping the primer bul

I tried pumping the primer bulb but it didn't do anything.
I don't think there is a fuel filter on the engine and I don't really know what a water seperater is. If you could explain.

Haven't check plugs yet.
 
if your spark and comp tests c

if your spark and comp tests come back good i would say some sort of a fuel restriction.

also check to make sure your timer base is moving all the way to the wot stop.....dont adjust the stop even if its adjustable you chance popping the motor.

you need some sort of filter i recently installed a water seperator from walmart cause ive had water in one of my small ob tanks and it will give you fits.it also takes the place of an inline filter....you can also buy one from this site.

maybe even the probs you have. you may have gotten some crap inside the carb causing a restriction...from not having a filter. in this case i would say clean and rebuild the carbs and do a decarb on your motor.
 
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