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  1. 03-07-2012, 10:44 AM #1
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    Has anyone put a 3.1 Yamaha lower unit on a 3.3 Yamaha HPDI????

    Was just wondering what type of performance changes there would be????? I know the gear ratio is different and obviously there is more drag with the 3.3 lower unit so speed may increase????? Has anyone had experience with this?
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  2. 21XDC
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    #2 03-07-2012, 12:14 PM

    Re: Has anyone put a 3.1 Yamaha lower unit on a 3.3 Yamaha HPDI???? (5 keepers)

    vafishing did and gained 5 mph http://www.bbcboards.net/zerou...=3130

    Marks Props 317-398-9294, 1850 East 225 South, Shelbyville, Indiana 46176 propellerman59@gmail.com http://www.marksprops.com/index.html
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    #3 03-07-2012, 06:12 PM

    Re: Has anyone put a 3.1 Yamaha lower unit on a 3.3 Yamaha HPDI???? (21XDC)

    can you check the link? It doesn't take me there....
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    #4 03-07-2012, 06:21 PM

    Re: Has anyone put a 3.1 Yamaha lower unit on a 3.3 Yamaha HPDI???? (5 keepers)

    It takes you to the profile of the guy that gained 5 mph... You can IM him there if you like.

    Marks Props 317-398-9294, 1850 East 225 South, Shelbyville, Indiana 46176 propellerman59@gmail.com http://www.marksprops.com/index.html
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    #5 03-08-2012, 03:39 AM

    Re: Has anyone put a 3.1 Yamaha lower unit on a 3.3 Yamaha HPDI???? (21XDC)

    thanks...
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