150 Johnson Ocean Runner missing bad @ 2500 rpm supect the SLOW MODE

abuckrub

Recruit
Joined
Jul 4, 2012
Messages
3
My 1994 150 Ocean Runner runs fine at lower speeds up to 2500 rpms then starts missing real bad. Feels like the prop is bent it shacks so bad.
After some testing I replaced both temp. sencors and the power pack. Motor ran fine this morning for about 3 hours.
Ran 20 min at 3600 rpm, fine , stopped & starter for short drifts and runs and some power drifting in the current. When I throutled up to run home same problem motor will not run up above 2500 rpms with out missing bad. Oh yea New Chapion plugs, fuel is fresh, New 10mic fuel filter also. I'm still thinking SLOW mode is tripping me up but, not sure how or what to check next.
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,148
Re: 150 Johnson Ocean Runner missing bad @ 2500 rpm supect the SLOW MODE

Maybe motor is going into SLOW because of overheating? You should check that out. Also check shift assist switch, which kills spark to 1/2 of motor.
 
Top