Getting more from 6hp in High Altitude

[dgalpine]

I have a brand new Tohatsu 6hp. with a stock 7.7" Dia. X 8.0" Pitch 3-Blade prop.

I used it recently at 5'300 ft. elevation and plan to only use it at higher elevations.

I could only get up to 6mph

I have read equal opinions on this, either the prop pitch needs to be smaller, install the high altitude jet kit, and the other is nothing will help.

Any thoughts? Thank you!

 

[airshot]

How big of a boat, heavy?? Need more info, but if it is a good sized boat, that may be all there is...

 

[dgalpine]

How big of a boat, heavy?? Need more info, but if it is a good sized boat, that may be all there is...

Its a 9ft inflatable zodiac weighs 110lb

 

[flyingscott]

I have a brand new Tohatsu 6hp. with a stock 7.7" Dia. X 8.0" Pitch 3-Blade prop.

I used it recently at 5'300 ft. elevation and plan to only use it at higher elevations.

I could only get up to 6mph

I have read equal opinions on this, either the prop pitch needs to be smaller, install the high altitude jet kit, and the other is nothing will help.

Any thoughts? Thank you!

sell the 6 hp and buy a bigger motor

 

[Scott06]

sell the 6 hp and buy a bigger motor

Yeah if you want to use it that high. You loose like 20% of power at that altitude.
yes normally you prop down in pitch and at 6 likely have to lean out your jetting, but you are only working with 6 hp, probably 4.5 at that altitude