yamaha 225 four stroke?

both engins seem to be starving for fuel one at 3000 rpm one at 4000 rpm. they start backfireing at that point and bog down.

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  • 1 decade ago
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    Assuming both engines are running off the same fuel tank and both are acting up, it looks like you can narrow it down to fuel, or fuel pressure. As you have been informed before me, alcohol, as in ethanol, can cause some grief. Start there. Try drawing some fuel into a glass jar. Let it set unmoved overnight, and see if you can see any beads of water in it the next day. Check fuel pressure too. That should be an injected engine(s), and requires a higher pressure than the early model carb type. Good luck my friend.

  • Anonymous
    1 decade ago

    check fuel pumps. actually it sounds like water in the fuel. alcohol has an affinity for water. using ethanol can create a pretty good amount of water in a fuel tank.

  • Anonymous
    1 decade ago

    timing

    stator

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