50hp johnson

[movinon]

1989 50 johnson, I can get 3/4 to full throttle but no more. My motor surges trying to get full trottle. Took off vro and replaced with pump cleaned up carbs and still nothing. Does anyone have any ideas?

 

[racerone]

I cannot get a hold of your motor.----You need to provide information.-----Post the results of a compression test first.

 

[movinon]

87psi

 

[movinon]

87psi both cylinders

 

[movinon]

This is what the motor sounds like.

 

[movinon]

I have put on a new hose and tank, replaced the fuel pump and removed the VRO

 

[racerone]

Well---87 PSI is low.----So you have a bad gauge or issues with your motor.---What boat ?---What pitch on the prop ?

 

[movinon]

I have posted a video on youtube of how the motor is running. The link is,

 

[racerone]

Test run with another hose and tank.

 

[movinon]

Could be a faulty gauge. Motor idles good and takes off strong just top speed speed seems to be the issue.
Prop is 13x11 on a 14ft aluminum starcraft.
New tank and hose.

 

[racerone]

Try a 15" or 17" prop on this motor.----Might be hitting the rev limiter !!

 

[movinon]

Great thought, I will try it. Odd that it takes off but won't get wot. Thanks

 

[racerone]

Might be hitting the rev limiter.----An 11" pitch prop would be used on a 20' pontoon boat.----Props / power / boat size / motor condition is a strange concept.

 

[movinon]

Thanks I will let you know how I make out

 

[movinon]

Hi, you were completely right, change the propeller and that worked.

 

[movinon]

Now I seem to have another issue. Motor will no shut off through the key or saftey switch. I've Check the wiring from the controls to the connector in the wiring box and it's all good. No breaks in the wiring. Could it be the power pack?