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  1. #1

    Yamaha xr1800 jetboat engines dying at 4000rpms.

    I have a 2000 yamaha xr1800 jetboat. It has twin 1200powervalve motors in it. The engines run great on land all the way to 7,000 rpms. However, when i get the boat in the water they will die at 4,000rpms. Did i suck something into the pumps? I didn't think i did, anyone have any ideas.

  2. #2
    Join Date
    Nov 2005
    does it die down slowly, Or is it a flat out die like it locks up.

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