pontoon pitch with insane tach....

[joakes]

I have a 94 parti Kraft 20 ft pontoon boat. It has a '77 70 HP johnson on it.<br />From what i have heard from others I need a prop in the 11 to 15 pitch range. It has a 14x17 on it now that came from the runabout that it was previosly on. I just bought a 14x13 prop from my dealer. He said that is what his chart called for. My tach is a faria, and does not seem to correspond with anything. It shows for example, 2400 rpm at idle and 7200 rpm all day at wot. If it were <br />in fact running 7200 rpms I suppose i would be asking about more than just a prop. Any suggestions? And tia...........Jeff

 

[Bob_VT]

Re: pontoon pitch with insane tach....

Check your tach connections OR get a new tach for an accurate diagnosis.

 

[page62]

Re: pontoon pitch with insane tach....

There's a selector switch on the back of the tach. You may need a small screwdriver to turn it. Change the setting until the tach gives you a more normal reading. (The switch adjusts the tach to the number of cylinders.)