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    2004 300hp hpdi yamahas- alarm issue

    Old post but having this exact issue right now. When mine goes in alarm - it shows as temperature at the gauge and also shows as an overheat on YDS. I have changed T-stats, Thermo switches, and Thermo sensor. Only does it at 3800 and above. Can run 3500/3600 all day - no problem. Also...
  2. G

    2004 300hp hpdi yamahas- alarm issue

    Hello - I see this post is almost 12 years ago - but if you see this, would like to find out what you determined to be the problem. I am still running twin 2004 HPDI's and having the same exact issue right now with my port motor.
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