wrong prop?

[critter34]

I removed a 70hp johnson off of a tri haul and put it on a starcraft aluminum v bottom boat i cant get the boat to plane what should i do?

 

[walleyehed]

Re: wrong prop?

Do we know the engine is healthy?

 

[Texasmark]

Re: wrong prop?

How about some more info like length of boat, length of lower unit, height of transom and the answer to kenny's question.

Mark

 

[critter34]

Re: wrong prop?

boat length is 17ft motor is a long shaft

 

[walleyehed]

Re: wrong prop?

Here at 3600ft above sea-level, to reach the correct RPM on a 17ft alum Starcraft SS with an 85HP V4 Johnson, it takes a 13-3/4X15P.
Now, consider I've lost basically 12% of my HP due to altitude. I'd say if your engine is healthy and you are less than 500ft above sea-level, a 15P should be close.

 

[critter34]

Re: wrong prop?

Do we know the engine is healthy?engine is very healthy 140psi in all 3 found out while cleaning carbs the high speed cicuit was plugged in one air wouldnt blow through it now i know what a three cyl. sounds like ,scary out of water with muffs