Motor problems. Any ideas?

Discussion in 'Hydrodyne® Boats' started by wentworthto1, Nov 12, 2016.

  1. wentworthto1

    wentworthto1 Hydrodyner

    Joined:
    Aug 25, 2008
    Messages:
    59
    Boat Model and Year:
    1961 Hydrodyne I/O BB70
    last time I had the Hydrodyne out, I couldn't get it to plane out but once. The rpms don't get high enough (about 1500-2000 less than what it should.) I just winterized it, but before I did, I tried getting it up to the right rpms on the trailer, but it just went to 4000 and then backfired and died out. I restarted it just fine. It just won't hold at higher rpms. The fuel pump, lines, and carb are all in good shape and I cleaned them before I got it winterized. What could the problem be? (I/O Volvo Penta 80 hp)
     
  2. jim

    jim Hydrodyne 18 Specialist

    Joined:
    Jun 14, 2006
    Messages:
    2,321
    Location:
    FL
    Boat Model and Year:
    77 Dyne 18 I/O converted to Outboard
    If it backfired,(through the carburetor) it is lean. Check your high speed jets and the associated passages. Clean is not always clean in the hidden places. There could also be a restriction in the float valve causing the chamber to go dry at high power.

    It could be a fuel delivery issue also, pump, lines etc.

    jim
     

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