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  1. #1
    Registered
    My Boats:
    Cigarette 1986 FlatDeck
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    Feb 2006
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    Saint Clair Shores
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    help Rpms all over the place

    new motor 509/550hp big block chevy,1.50 grear bravo drive,2000 awsome 260fx 26 foot cat, no throttle response-climbs to rpm slow/ also rpms are all over 4100-5100, my msd box is set for 5600 im running a 24 pitch prop tops 71mph on gps, and everyone else is running a 28 pitch prop with 500 hp running 80's on gps, any ideas I changed the carb from a 950 to a 750 just to try no change so i put the 950 back on, no back fire at full throttle.

  2. #2
    Registered monstaaa's Avatar
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    fountain
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    long island, newyork
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    hows the ignition system?

  3. #3
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    39' Sea Ray, 38' Nortech, 18' Taylor SJ
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    Jun 2006
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    Lake Conroe, TX.
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    Timing is off. And or, weak coil, Bad MSD box, Springs loose or worn out inside distributor. Probably should have that engine set around 32 degrees total.

  4. #4
    Registered PatriYacht's Avatar
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    94 43SC Black Thunder
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    Waterford,MI
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    Check engine grounding.

  5. #5
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    39' Sea Ray, 38' Nortech, 18' Taylor SJ
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    Quote Originally Posted by PatriYacht View Post
    Check engine grounding.

    Ah Yes


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