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  1. Scott Danforth

    Not getting Spark on '86 3.0l Alpha 1

    Yellow with red stripe is crank signal. Not your issue if it cranks. Back to dwell. If the dwell meter isn't registering anything while cranking, you have a points issue.
  2. Scott Danforth

    Water in oil

    If it's closed cooled, make sure the AF is up to snuff. It's supposed to be changed every 5 years or so I would still pressure test the system (must be drained first). Being closed cooled makes that easy If the block passes that test, simply change oil and filter, run for 5 minutes, change...
  3. Scott Danforth

    VP 4.3GS Carb Tuning Vacuum Port?

    Nope, threaded brass plug unless someone installed that aftermarket clear plastic plugs ( not marine approved)
  4. Scott Danforth

    1987 Larson 120 motor removal

    You can leave it in, however it adds 4-5 hours of work during the process and you have to have the drive out to align the drive Just pull the drive since you have to pull the drive every year for PMs. Motor should take less than 45 minutes to pull
  5. Scott Danforth

    Wellcraft 250 Sportsman

    That transom is no longer straight. That means there is rot going on
  6. Scott Danforth

    Manifold Bolts/Studs

    Yes. Just coat the threads with Permatex #3 (aviation)
  7. Scott Danforth

    VP 4.3GS Carb Tuning Vacuum Port?

    All Holley carbs have externally adjustable float. Pull sight gauge, fuel should be at bottom of sight hole
  8. Scott Danforth

    Water in oil

    Only take 2 oz of water to froth oil Did you drain the block and manifolds before pulling Anti Freeze in? If you didn't drain, you most likely have a cracked block Drain the water, pressure test. Should hold 15psi forever
  9. Scott Danforth

    Water in oil

    Rain won't get into the motor unless the whole motor was underwater Is this a salt water boat? How was the boat winterized? Most Mercruisers after 2000 have a drain hose connected to the garboard plug.
  10. Scott Danforth

    4.3 runs great for about 30 minutes then bogs, pops won't accelerate

    It's never the coil
  11. Scott Danforth

    My boat run slowly. 120HP,2.5L,1989

    Find a 3.0 and Alpha 1 Gen 2 and drop in. Plenty in rotten Bayliners Will be less than rebuilding what you have, even paying customs, VAT, etc
  12. Scott Danforth

    VP 4.3GS Carb Tuning Vacuum Port?

    What sized Holley? 4150 or 4160? Did you verify the idle transfer slots when you had the carb off If your fouling plugs, you are too rich Start at 3/4 turn out at mix screws. Make sure the float levels are set (external adjustment) When you had the carb apart, did you make sure the air...
  13. Scott Danforth

    hei ignition retrofit

    Only one I know that is marine rated is DUI. Davis Unified Ignition
  14. Scott Danforth

    Mercruiser won't go above 1000 rpm.

    What is your fuel pressure?
  15. Scott Danforth

    hei ignition retrofit

    Who's HEI setup?
  16. Scott Danforth

    transom repair options

    Won't work, but it's your life. And you could never dry it out even if it sat in the desert for 10 years
  17. Scott Danforth

    VP 4.3GS Carb Tuning Vacuum Port?

    I was taught the technique in the mid to late 70s lol. By the same hot rod shop owner that taught me to rebuild Holley carbs
  18. Scott Danforth

    1986 seaswirl nightmare

    Start by servicing the impeller
  19. Scott Danforth

    Close on the formula

    A 10243880 with a mechanical pump?
  20. Scott Danforth

    Prop size 1989, Mark cruiser, 3.7,18.9

    Take your current prop, and do a run, 3-5 miles at WOT, then come back the other way document your RPMs and your speeds. If you are getting 4600-4800 RPM, the 19 pitch prop is correct
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