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DF140hp 2006 model fault 5000 revs

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  • DF140hp 2006 model fault 5000 revs

    We have four of these and one has developed a problem.
    This engine will start fine from hot or cold.
    But after reaching operating temperature, above 4000 rpm, the engine starts to falter as if there were a fuel or air issue. Once back below 3000 rpm it is fine.
    This has happened after a recent service where the cylinder head/thermostat was replaced due to a crack after overheating problems.
    It has been back to a suzuki main dealer who have run diagnostic checks using their computer, but this suggests that all is ok, air/fuel etc. So we are at a loss to know where to find the fault.
    We have also, swapped parts including the ECU from our other engines and also throttle cables and all the obvious things.

    Please HELP!!!!!

    alex... Corfu Boat Rental - from Agni boats, speedboats for hire from Alex and George

  • #2
    clean vst or have you done that

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