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  1. Replies
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    The only real way to increase rpm's, just from...

    The only real way to increase rpm's, just from working the pump, are to either cutback the impeller, induce slip, lighten the impeller or handwork the foot to "scoop" or increase the ram effect of...
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    Stainless is a must no matter what. For...

    Stainless is a must no matter what. For performance and durability. 3 vs 4 blade and 7 3/16" vs 7 3/8" is more complicated with the smaller motors.

    MPH and holeshot gains are usually had from...
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    I'd agree to a point. If the motor is struggling...

    I'd agree to a point. If the motor is struggling and can only turn 5000, to me it seems like it's going to struggle all through and RPM range and possibly use more fuel and be harder on the motor.
    ...
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    I'm pretty familiar with touching up the jet...

    I'm pretty familiar with touching up the jet units. Sharpen the and polish the blades, bevel/blend the liner to the housing, teardrop the grates, smooth the casting lines, port the housing, keep the...
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    I'm up in Washington state. Thanks for the...

    I'm up in Washington state. Thanks for the offer.

    I was thinking, since its a jet, that a lightened flywheel would make a larger difference.
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    Mild Yamaha 90 Outboard Jet

    Looking at trying to squeeze a few more HP and RPM out of a early 2000's Yamaha 90 2 stroke. It's going on outboard jet so motor/boat setup is basically already set up. Holeshot is most important...
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