larger outboard

[mbarone]

I have a 12' aluminum duranautic, the transom specifically says maximum of 10 HP. I currently have a 9.5 Johnson on it but it doesn't push the way I want it to, it runs flawlessly so that is not an issue at all. What I'm wondering is, would it be extremely dumb to put a 15hp on it?

 

[Pokertrampp]

Re: larger outboard

I have almost the same set up with the exception of mine is 14' and has a 9.9 Yamaha 4-Stroke (wich is a pretty heavy motor). it works very well gets up on plave almost immediatly. have you checked your motor height? made a big difference on mine, I ended up having to add a bracket to raise mine another 2 inches, and it a short shaft motor. also, have you tried a different prop pitch?

 

[Chinewalker]

Re: larger outboard

I also have a 12-foot Duranautic and I've run a lot of motors on it over the years. A 9.5 should flat out boogie! Does yours have a lot of hours on it? How is compression?

 

[ezeke]

Re: larger outboard

One other thing that you might consider is lowering the pitch on the propeller. You can go as low as 6.5 pitch using a Michigan Wheel #012068.

 

[kenmyfam]

Re: larger outboard

I have a 12' aluminum duranautic, the transom specifically says maximum of 10 HP. I currently have a 9.5 Johnson on it but it doesn't push the way I want it to, it runs flawlessly so that is not an issue at all. What I'm wondering is, would it be extremely dumb to put a 15hp on it?

Always been like this ??? or was it OK and got worse.
Set up of the motor and weight distribution in the boat are huge factors in a set up like yours.
I agree, if the motor is in good shape and the loading is good it should boogie !!!

 

[mbarone]

Re: larger outboard

The anti cav plate is dead even with the keel. when i got the motor i dropped it off at the local marinas shop to have it gone over, after 2 days they said it was perfect other than changing 1 gasket. I think the weight is distributed pretty well, tank and battery up front along with the 2 anchors (i tried it all towards the back, wont do that again) i think I'm down to trying a lower pitch or just dealing with it. thank you everybody that gave advice, very much appreciated