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  1. jimmbo

    OMC 4 blade propeller - AMC-444

    It is a Prop for an OMC outboard, it is not an OMC Prop. Michigan Prop 4 blade 10" Dia 11" Pitch. It would fit on the Big Twin type of Outboards; 25hp(1951-55), 28hp, 30hp(1956), 35hp(1957-59), and 40hp(1960-76, and the later commercial models).
  2. jimmbo

    9322B 9.5hp evinrude oil mixture

    I rarely noticed any smoke running a 50:1 or 24:1 mix. I usually wanted smoke, to help keep the Mosquitos away
  3. jimmbo

    Broken Driveshaft

    Before you spend money on another gearcase, make sure the Powerhead is not damaged. Scored Cylinders/Pistons and warped Heads are common Features of overheated engines. I suspect that Overheating would be one of the reasons the previous owner sold it
  4. jimmbo

    Johnson V4AL-14 not pumping Cooling Water

    Water will exit out of the Idle Relief
  5. jimmbo

    18' 190hp bowrider nicked prop upgrade

    What is the Gear Ratio of the Outdrive?
  6. jimmbo

    '22 Mercury 115 Pro XS, best prop?

    I would verify that the Tach is set correct first. Myself, I would ditch the 4 blade, and use a 3 blade, that by itself will raise the PRM, reduce drag, and increase Speed. Dropping Pitch will certainly make for quicker Acceleration, as for top speed? Dropping one Blade will increase top speed...
  7. jimmbo

    What is the cause of only getting 75% power at full throttle , but 100% with a bit of choke .

    An off idle stumble is often caused by a Lean Idle Circuit. There might be a bunch of Gum/Varnish in the Area, which requires removal of the carb, and removing the Welsh Plugs and cleaning all the stuff out. I have used Power Tune, or Combustion Chamber Cleaner added to the gas, as it is more...
  8. jimmbo

    33 hp Johnson no spark

    New Points have a smoother contact area, and are much easier to gap in a consistent manner. Filed points are a lot rougher, and can result in a gap that is different than the what the Feeler Gauge measures. Filing also removes a Harder Surface, exposing a softer surface which erodes faster.
  9. jimmbo

    Mercury Blackmax 150HP idle

    Part of the Cowl says 1984 or 85. That was the only year the Brown Decals were used A motor can run and sound fine running on 3 out of 6 cylinders when on the Muffs. It is a different Story once the Motor is in the water, and there is Back Pressure on the Exhaust. Verify that you have a Strong...
  10. jimmbo

    Gel coat vs Epoxy paint

    In 1974 our 16 ft Evinrude was painted with an Epoxy paint, it was a very thin coat, and it stuck to the Gelcoat very well, for over 40 years I have been trying to scratch it off a piece of the Dash, the Gray was covered by a piece of trim when the blue was applied.
  11. jimmbo

    1963 johnson 40 hp electric

    Normally the nut should remain in place, as the Needle is turned. Is the Needle bent? Is there adequate packing behind the nut, and is the nut tightened enough to keep the needle from changing set point?
  12. jimmbo

    What is the main cause of an outboard that's hard to start again after it's already warm

    Could be a Heat problem in Ignition System, or a high Fuel Level causing flooding. Todays crappy Gasolines are refined for FI systems where the fuel is under pressure in the lines, but it might flash too easily in a carb where the Air Pressure on it is Atmospheric which is lower, especially if...
  13. jimmbo

    4 to a 2 barrel carb

    The differences between Carbs is often not just Jets/Metering Rods, but Air Bleeds(not easy to change), Off-Idle Transfer Ports(pretty much impossible to change), Power Enrichment Circuit Calibration and Metering. A Q-Jet is a prime Example, It was used on just about every engine size over 250...
  14. jimmbo

    1957 35hp johnson

    When taking the Compression, was it done cranking the Motor with the Starter, or using the Recoil? If using the Recoil, that Engine has a Compression Relief System which lowers the Compression to make it easier to pull the Rope, and it would need to be disabled to get the true Compression...
  15. jimmbo

    5.0 swap to 5.7 what carb is the best

    Holley does make a 4175 650CFM Spreadbore Marine carb. https://www.holley.com/products/marine_and_powersports/marine/marine_carburetors/parts/0-80552 I have used it on my Volvo 5.7. It gave me about another 400 - 500 rpm over the stock Holley 500CFM(370 CFM, when Flow Rated as 4bbl) 2bbl. I...
  16. jimmbo

    Evinrude family heirloom

    From the 1961 Brochure
  17. jimmbo

    1958 evinrude lark 35 hp 35514 water pump

  18. jimmbo

    Why can’t I find information on my Mercury outboard using my S/N????

    A lot bring in their old "mint" engines, and when given the Estimate, decide they aren't willing to spend $1500 on a 40+ yr old engine, nor do they want to pay for the time to diagnose, and do the Estimate. Some just walk away, abandoning the motor.
  19. jimmbo

    Identifying old SS OMC prop size

    I can't remember what year that was from, probably early 80s. Some of the Part #s have been superseded, and there have been newer designs since then. At least OMC offered a large choice of Props for the post 68 V4s, for most of the pre 69 V4s, only 3 were offered.
  20. jimmbo

    Why can’t I find information on my Mercury outboard using my S/N????

    A lot of the Parts People have trouble when trying to look up Parts for Older Mercs, the Info is available from Mercury, but some attention/diligence is required
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