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Thread: 300 hpdi

  1. #1
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    300 hpdi

    are 300 hpdi any good for performance I have one good one that's an excellent shape and one with a bad cylinder I have all the riggin. I was thinking of installing them on a 30-foot Hall that I own please be kind to me I'm an old Mercury guy and no nothing about yamaha hpdi

  2. #2
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    Yea man, they are ok. The never put out anything close to 300 hp. in a stock form. Porting is setup for less than 6400 rpm. Compression in stock units is near 100 psi. Pipe is too long.

  3. #3
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    call Bender!!!! this is a must! i have a 2004 300 hpdi on a 21 superboat... im slow.... i run a 30 pitch prop. like the Bravo 1 4 blade.
    but every machine is different... clean filters and good gas are a must....

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