1996 60 HP Johnson Runs Slow

[sthurman]

Just bought a 1997 used 20' Voyager Pontoon wit a 96, 60hp Johnson engine. Motor Runs perfect however it top end only turn about 3600 rpms and boat seems slow compared to others of equal size. Any one have any info on how many RPM I should be turning and possible causes for slow speed?

 

[wingnit TPA]

Re: 1996 60 HP Johnson Runs Slow

Could be several things. Have you tried pumping the fuel bulb? When you pump the bulb, does it accelerate or is the bulb firm?

 

[sthurman]

Re: 1996 60 HP Johnson Runs Slow

The bulb stays firm and engine rpm is consistant except when making hard quick turn the boat slows way down.

 

[Dhadley]

Re: 1996 60 HP Johnson Runs Slow

Sounds like it's only running on two cylinders. Could be spark or a clogged carb.<br /><br />Good luck!

 

[Kiwi]

Re: 1996 60 HP Johnson Runs Slow

..... or you have a prop that is way to big for the engine. What pitch prop are you running ?

 

[sthurman]

Re: 1996 60 HP Johnson Runs Slow

No idea what pitch prop I am running. Any Idea what I should be running and what normal rpm should be @ full throttle?

 

[Kiwi]

Re: 1996 60 HP Johnson Runs Slow

hhhmmmmm this might be one for Dhadley ... I would say at least 5000rpm