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Discussion Starter · #1 ·
I have a short shaft tiller on my 13' gheenoe that won't push this boat. I've tried every trim position on the motor. It won't open up. Every time I get up to speed the motor rev's and the prop loses bite. I had a 5hp that worked fine just needed a little more speed. I've been told it could be the hub or it could be the shaft is too short for the hull? Need some insight before I throw more money at it.
 

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I would doubt it's the hub I would look at motor height, What pitch prop are you running? Sounds like your blowing out when you try to plane off?
 

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Discussion Starter · #3 ·
I can't get the motor any lower without a jack plate.  I think it standard 8 pitch.  I believe it's aluminum.  It has 8 stamped on it. And yes it will move, but when wot it blows out.
 

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Something is weird I run those motors and they haul azz !

make sure the foot of the motor is as close as possible to the transom "tucked" 8 pitch is about right
 

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Discussion Starter · #5 ·
Well, I solved my own problem. Thanks for the insight, though. It always helps if you have the correct prop on the motor. Thanks craigslist. Here's a before and after. I decided to go buy another prop, one that was designed for a Nissan, and not a Yamaha. I didn't inspect the motor close enough when I bought it. There was a gap between the prop and the lower unit itself with the old prop. Then there's a pic of the new prop that's designed for it. No gap. I'm running it tomorrow to see how it works out.

Before


After
 

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WOW ! 

That White prop has 12 splines ???

all the 8 hp yamaha motors I have seen have 8  :eek:



If you have an 8 spline yamaha prop I'll buy it ...send me a PM ;)
 

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Discussion Starter · #8 ·
Motor works great now that the prop has been changed. As far as that prop is concerned it does have 12 splines. I only thought it was a Yamaha prop because of the guy I bought it from. He worked at a Yamaha dealer.
 
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