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Recent content by S61TrunkMonkey

  1. S

    Yamaha HPDI 300 losing power intermittently at higher RPM's

    Hey Everyone, I am needing some help with an issue. I have a 2005 HDPI 300 LZ300TXRD. At higher RPMs 4500+ the engine feels like it switches from 6 cylinder to 4 then back to 6. The hesitation last 2-6 seconds and happens 2-3 times a minute. Its sudden like a flick of a switch. This engine...
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    LZ300TXRD Help plz

    Problem found, cheap fuel line, inner sleeve imploded.
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    LZ300TXRD Help plz

    I am closer to understanding the problem. I hooked the engine up to some water in the driveway, the clear filter bowl on the side of the engine will be full after priming or sitting. Once I start the engine the fuel sucks down half way down to the bottom of the filter and then the engine dies...
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    LZ300TXRD Help plz

    Mystery filters, O-rings for the injectors, and thermostat with gasket on order. I also ordered an ultrasonic cleaner for the injectors and fuel pressure regulator. I will report back. Anyone have any other ideas?
  5. S

    LZ300TXRD Help plz

    Spark is good
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    LZ300TXRD Help plz

    *Update* I hooked it up to some water in the driveway, it started up fine, but is idling rough bouncing between 600 and 1200 RPMs and will finally bottom out and die. Coils and fuses tested fine.
  7. S

    LZ300TXRD Help plz

    As is, 261 hours private purchase. The engine did sit for awhile. The engine does Pee well, has a steady stream.
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    LZ300TXRD Help plz

    Hello Everyone, a quick introduction here. We are a military family boating on the Pamlico River in NC. We picked up a used Yamaha LZ300TXRD got it mounted to our custom built 33ft pontoon boat and we have had some fuel issues. The engine will run fine at idle, and also with choke. Once the...
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