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  1. Yamaha 90hp Homlogation sheets/ Stock port dimensions

    Ok this may be a long shot but I thought I would try. I was wondering if anyone on this forum had a copy of the UIM homogenization sheets for this particular engine?

    If not the standard factory...
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    88workcar thanks for posting very helpful and...

    88workcar thanks for posting very helpful and informative post.

    Karl Kretzmann your boat look amazing:eek: very nice rig, and very fast. I have herd the batboats can get into the low 70s with a...
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    Hi Karl Kretzmann, Yes the Argocat is a very...

    Hi Karl Kretzmann,

    Yes the Argocat is a very incredible rig, I understand they are very fast with a 1.3liter outboard.

    How fast did your one go with the setup you had? How about handling? I...
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    Some very good points made thus far. I have...

    Some very good points made thus far.

    I have talked to a couple of performance tuner shops, and they all think the modified 70hp can work and should perform better, because of the more broader rpm...
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    Lets compare to engines of the same manufacture. ...

    Lets compare to engines of the same manufacture.

    90hp Yamaha
    weight 261 lb
    20in shaft motor
    rpm range 4500-5500rpm

    70hp Yamaha
    weight 228 lb / 33lb less then Yam...
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    Help with motor selection

    Hi everyone,

    First I would like to thank all the contributors of this form, I have learned a lot from reading the many post on here. Thank you

    I'm planning to race in my local offshore...
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