Johhson Motor

[Pontoon2]

I have a johnson 50hp with 275 hours on a pontoon.This just stared happening,going along at 30 to 35 mph it acts normal push it up to 36-38 mph it jumps to40-50-60 on the speedometer by it's self the motor starts raceing fast & get's loud.What could be the cause.Any suggestions.<br /> Thank You

 

[Joe Reeves]

Re: Johhson Motor

That explanatioon indicates that the hub is slipping within the propeller. It can be rehubbed by any reliable propeller repair shop.

 

[steamboatwilly]

Re: Johhson Motor

Joe, Did he say the speedometer jumps 40-50-60?

 

[G DANE]

Re: Johhson Motor

What kind of pontoon is going 38 MPH with a 50 HP ? Are you sure your speedo is in working order. Where is the pichup placed, and when did you last change any installations within 10" from the motors lower unit, i exa speedo pickup location ? Could sound like something is making prop ventilating.

 

[Joe Reeves]

Re: Johhson Motor

James.... Yes, that's what he said but I disregarded that portion of the post as it sounded like a misquote.

 

[CFronzek]

Re: Johhson Motor

You've got the worlds fastest pontoon boat. Let us know how fast it goes when the prop hub is fixed.

 

[CalicoKid]

Re: Johhson Motor

Maybe you're looking at the tach (35 x 100, 40 x 100, etc)?