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  1. #1
    PWCToday Newbie
    Join Date
    Apr 2017
    Location
    House
    Age
    40
    Posts
    2

    Yamaha FX1000 does 8000 RPM but only 34 KNOTS, any help will be appreciated!

    Hi , I need help on leads where to look ...
    my jet does 8000 rpm but 34 knots only speed.

    - by doing 8000 rpm make me think is not the injectors
    - run it with no seats in case the air was short, no difference
    - Brand New impeller and housing...no rubbish inside
    - Run it with no air filter same thing..

    any help will be appreciated...

  2. #2
    PWCToday Newbie
    Join Date
    Apr 2017
    Location
    House
    Age
    40
    Posts
    2

    Re: Yamaha FX1000 does 8000 RPM but only 34 KNOTS, any help will be appreciated!

    Solved. It turnup so simple.... i had brand new spark plugs and therefor i never try to check them properly... however i did that just now, checking the plugs one by one turnup cylinder 3 spark didnot had fire spark... i know its brand new but for some reason was not working... i replace it with other, crank the engine and sparks showed up.... i been running the engine on 3 spark plugs only....no wounder...
    Funny the engine sounded good... but i think because the 4th cylinder was working covering for the 3rd....

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