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how can i modify a 25hp?

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  • how can i modify a 25hp?

    Hi all
    i am in a small competition and we race the cyber 370 boats with a yamaha 25hp motor. i am trying to find where i can order some performance parts i.e. flywheel, pistons, reed valves etc. all i can find is stock items. or else is there is some old tricks on how to modify a small 2-stroke motor? please, i really need your help
    thanks in advance
    Mark
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