just a little faster...

[ferrariman]

Does anyone know of any fairly inexpensive way to squeeze a litle extra power out of a two stroke 1989 25 hp johnyy. I have already put in a larger card and intake manafold wich gave it a little extra go ecspecially off the line

 

[Solittle]

Re: just a little faster...

What is your max rpms at WOT? And - where is the cavitation plate relative to the bottom of the boat? This will tell us if you are getting the maximum out of what you have.

 

[ferrariman]

Re: just a little faster...

T

 

[ferrariman]

Re: just a little faster...

The cavitation plate is exactley inline with the bottom of the boat and and max rpms are 5700

 

[steamboatwilly]

Re: just a little faster...

How about a bigger prop?

 

[lark2004]

Re: just a little faster...

you could probably come up a little bit, try 1/2 to 1" and see what happens. Don't let it rev over 6000. Also be carefull not to go too high and lose water presure to your cooling system.

 

[sprouticus]

Re: just a little faster...

try different pitched props.

 

[tashasdaddy]

Re: just a little faster...

is the boat loaded properly, gas tank, battery(if elec start), passergers, all balanced bow to stearn, port to starbord. will help

 

[Dhadley]

Re: just a little faster...

Now youre talkin'! I wish you had the thru hub style lower unit but thats OK. As mentioned, watch your water pressure, thats very critical. But dont be afraid of rpm. We've turned that style powerhead more rpm than you'll ever get to. As long as theres a load on the prop we're OK. <br /><br />Again -- as mentioned, try raising the motor some. I'd go up a 1/4" at a time and record the results. It all depends on the hull design right now. You'll get results something like -- change, gain, change, gain, change, same, change, lose.<br /><br />Make one change at a time!!! IE -- dont change load and height and then test. Change the load then test. Then change the height and test again. One change at a time!