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  1. 07-02-2019, 12:50 PM #1
    ameneddie
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    2002 225hp Vmax Ox66

    I noticed that the 225hp & the 250hp are both 3.1L. What is the difference in the 2 motors. Is it relitively easy to make the 225hp into a 250hp. Thanks
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  2. 1bluemcm
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    #2 07-02-2019, 01:20 PM
    The 200 is 3.1L too. I thought the 200 and 225 were more similar and the 250 was a little different somehow, but I'm not totally sure if that's correct, or how. I think it's computer related, could be heads and compression too, just not sure. I bet you'll get an answer here though.
    Kevin | 2000 Champion 19​1 | 2000 Yamaha OX66 200hp
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  3. 01BCproguide
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    #3 07-02-2019, 02:46 PM
    Not an expert but I think it’s porting and fuel mapping. I want to say I read somewhere that the 250 heads are cut a little different as well.
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  4. JoeFriday
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    #4 07-03-2019, 12:27 AM
    Quote Originally Posted by ameneddie View Post
    I noticed that the 225hp & the 250hp are both 3.1L. What is the difference in the 2 motors. Is it relitively easy to make the 225hp into a 250hp. Thanks
    Based on what I understand, it is not as easy as you would think. The current Sho's just need a ECU flash, but the Ox66's require more.
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  5. TwinStick
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    #5 07-03-2019, 09:55 AM
    Quote Originally Posted by 01BCproguide View Post
    Not an expert but I think it’s porting and fuel mapping. I want to say I read somewhere that the 250 heads are cut a little different as well.
    This is my understanding as well.
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  6. CJ1
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    #6 07-03-2019, 10:03 AM
    To make a 225 into a 250 you would need porting, heads and the CDI. But from experience the CDI made very little difference. CJ
    2002 X19 200HP OX66 HO Vmax,HPDI lower, it lives, thanks Hydro Tec.
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  7. yam911
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    #7 07-03-2019, 04:03 PM
    Different blocks.
    Different cylinder heads.
    Different reed valve assembly.
    Different reed set.
    Different lower unit.
    Different CDI unit.

    It is easy to convert a VX225 to a VX250. It is also expensive.
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  8. 01BCproguide
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    #8 07-08-2019, 04:53 PM
    Quote Originally Posted by yam911 View Post
    Different blocks.
    Different cylinder heads.
    Different reed valve assembly.
    Different reed set.
    Different lower unit.
    Different CDI unit.

    It is easy to convert a VX225 to a VX250. It is also expensive.
    when you say blocks are you referring to different porting? All three share the same displacement 3.1l block
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  9. yam911
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    #9 07-08-2019, 08:07 PM
    I have no idea what the difference in the blocks is. It could be the porting. It could __________.

    The blocks have different part numbers. Something is different or they would carry the same part number.
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  10. 01BCproguide
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    #10 07-09-2019, 08:14 AM
    Quote Originally Posted by yam911 View Post
    I have no idea what the difference in the blocks is. It could be the porting. It could __________.

    The blocks have different part numbers. Something is different or they would carry the same part number.
    Didnt know they had different part numbers. Good to know
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  11. CJ1
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    #11 07-09-2019, 10:03 AM
    Quote Originally Posted by 01BCproguide View Post
    Didnt know they had different part numbers. Good to know
    Because they are ported differently. CJ
    2002 X19 200HP OX66 HO Vmax,HPDI lower, it lives, thanks Hydro Tec.
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  12. ameneddie
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    #12 07-15-2019, 09:44 PM
    I guess 225 hp is enough
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  13. CJ1
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    #13 07-16-2019, 10:46 AM
    Quote Originally Posted by ameneddie View Post
    I guess 225 hp is enough
    Put a set of heads and reeds from HT and you will be happy and have your 250HP. If you have a lighter boat do a tuner. CJ
    2002 X19 200HP OX66 HO Vmax,HPDI lower, it lives, thanks Hydro Tec.
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