1981 Sundancer 260 She's on the water (!), but low performance >3000RPM

Discussion in 'Classic Sea Rays' started by Bill Nelson, Feb 13, 2020.

  1. Bill Nelson

    Bill Nelson Member

    58
    Oct 21, 2019
    New River, AZ
    1981 Sea Ray Sundancer
    5.7 L Mercruiser
    Hi all,

    Due to boatloads of help from y'all, old girl is on the water. Actually left the dock, and returned to it under her own power!

    Small miracles.

    Took it easy most of the trip around the lake, but a few times when I was a bit froggy and advanced the throttle past 3000 rpm, she would choke and spit like a teenager asked to clean their room.

    I pumped all the old gas out (40 gallons!) replaced the fuel filter, fuel screen and am having the carb rebuilt. Anything else to look at?

    Thanks!

    Bill
     
  2. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    2002 410DA
    Caterpillar 350HP 3126
    those are a good start. How about complete the tuneup with plugs cap wires and rotor? Read the plugs when you pull them and it might tell a bit of the story
     
    Bill Nelson likes this.
  3. Bill Nelson

    Bill Nelson Member

    58
    Oct 21, 2019
    New River, AZ
    1981 Sea Ray Sundancer
    5.7 L Mercruiser
    Good ideas. Cap and wires look fairly new but worth it to just replace 'em and the plugs for sure.
    Thanks!
    Bill
     
  4. Ned

    Ned Member

    110
    Sep 30, 2019
    Lake city fl
    1973 searay srv with 302 engine .
    302 ford
    Replace the coil.
     
  5. El Capitan

    El Capitan Well-Known Member

    Jul 9, 2014
    Chicago IL./Vero Beach, Fl
    1970 SRV 180 w 2.5L Mercruiser.
    2000 Ford Expedition Eddie Bauer
    120HP Mercruiser
    Was it coughing or misfiring?
    Any backfire or was it hesitating?

    This should give you clues as to source ie carb, fuel delivery, or spark. :)

    The ole fuel, air, spark method.
     
  6. hpcrank

    hpcrank Member

    136
    Feb 4, 2016
    Col. Spgs, Co-Lake Pueblo State Park
    1981 260 Sundancer with rebuilt 454/Mercruiser330-I/O. w/ alum. hard top with front and side wdos
    One rebuilt 330 hp. 454 Chevy
    Replace points and condenser too, you will have to reset the timing after installing points. Points on my 1981 330 454 are set at .018. Time per your book or set at 12 deg. BTDC then when warmed up retime for best idle. To really get it dialed in, reset timing on the lake/ocean at full throttle under way (2 person job). Total timing will likely be in the 32 to 34 range. Good luck. Remember this " most carburetor troubles are in the ignition!

    hpcrank
     

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