FX Speed #'s and What prop are you running

[carltonm1]

With my fx I'm only seeing about 73 it came with a 27 pro-v-Max prop. This is both tanks full and livewells full and loaded with gear. I'm only turning about 5800 RPM's. Everything i have read and heard I should be at about 76 to 77. The jack plate is set from skeeter and they told me it should be really close.

[go-fish]

IMO, whatever FX & setup you or the few others that have them, I only have to you
You guys are the pioneers in this line of the bug.
Play with the jack plate height w/ an eye on water pressure.
With all that fuel, gear & livewells full( of fish) I'd be happy with your #'s.. Run the tanks almost dry, remove most the gear, empty the livewells & you to may see the speeds you've read about.

[Doug Vahrenberg]

Matt Herren told me at the Classic to run the 25 and it was the best he'd found for performance.

[skeeterfx]

Let me know what you find out. I have a 27P and it smokes with one person and light load. Put (2) guys in and full livewells and gas and it barely runs over 70. I think I need a 25P. In the performance bulletin Yamaha used a 26P which isn't even offered???

[Doug Vahrenberg]

I was running 27T1 at about 5800 with Atlas Jackplate on 3.

[skeeterfx]

According to what I have read it has to be a ventless prop or it will ruin the motor??

[Doug Vahrenberg]

27T1 was shipped from factory with it. My buddy just got a 225 SHO on ZX225 and it had 25T1 on it.

I don't see how a vent or ventless prop can ruin a motor? Exhaust has pressure and seeks the path of least resistance either thru the hub or thru the vent holes. Especially when it was sent from the boat manufacture with a vented prop.

[skeeterfx]

I know a ventles prop on a 2 stroke will ruin the motor...per Yamaha. Not sure of the other way around. I am curious. There is a reason for the ventless??

[21XDC]

A vented prop takes the "lugging" holeshot away. Lugging hurts a 2 stroke motor. The SHO has so much torque it doesnt lug and may vent too much. Being a 4 stroke it's fine.

[skeeterfx]

I have been researching this quite a it to find the right set up for my boat. I have read in several sites that this motor runs best with a ventless prop. In fact, if you use a vented prop it will mess up the variable valve timing of the engine when it unloads on plane. Yamaha says use a ventless and definitey do not run a ventless on a 2 stroke. I'm sticking with the ventless to keep things running correctly...my opinion.

[SkipM]

A vented prop will will hurt accel on a SHO. It may be only a tiny bit, almost unnoticeable to quite alot. It will not hurt the eng at all.