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    300 HPDI rpms up/down and alarms/safemode

    can anyone offer some help please....it may take awhile but I'll do my best to give a thorough description of the current situation. I have a pair of 2004 300 hpdi's, one has problem for couple weeks i've been tinkering with myself. Yesterday I put in new spark plugs, a new waterpump kit...
  2. I

    2004 300hp hpdi yamahas- alarm issue

    port engine causes alarm and shutdown protection anytime i try to run it above about 3800rpm. accelerates well and will run higher rpm for maybe 20-30 seconds, then can hear and see rpms begin to fall, then constant audible alarm. alarm clears as soon as pulled back to neutral, and then can go...
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