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  1. 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.
  2. 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...
  3. 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.
  4. 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?
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. jimmbo

    Evinrude family heirloom

    From the 1961 Brochure
  10. jimmbo

    1958 evinrude lark 35 hp 35514 water pump

  11. 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.
  12. 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.
  13. 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
  14. jimmbo

    Transom adaptor from 15" to 20"?

    The 35 was rated at the Crank, the 40 is rated at the prop, and used to be a 50 horsepower at the Crank. The 35 has a displacement of about 38 cu in., while the 40 is 44 cu in. The 40 will be a much smoother engine, especially at low speeds, and is very easy to rope start as it has 4 smaller...
  15. jimmbo

    Identifying old SS OMC prop size

    Here is a page from the OMC Accessory Catalog
  16. jimmbo

    Pics of your Fiberform boat

    Anyone know the Model Name of this Fiberform hull?
  17. jimmbo

    1973 Evinrude 50373r lubrication questions

    The Manuals from that Era, would say OMC Type C, now known as Premium Blend, simply because that was the only Gear Oil OMC marketed. A couple of yrs later, they came out with HiVis for use in anything but the Electrics and Hydro Electrics. Prior to the Electric Shifts and Type C, the Oil...
  18. jimmbo

    Has anyone seen or heard of a trailer tire doing this?

    Better to have it delaminate there than on the Trailer going 110km/hr, like mine did
  19. jimmbo

    Gear case hole?

    Is it gear oil? The stuff stinks to High Heaven, while 2 stoke Oil doesn't smell too bad.
  20. jimmbo

    Does this gear and clutch dog look ok?

    Only if you want to be taking it apart again soon. I suspect your Father in Law was one of those who 'Eased' it into gear. That, and shifting at too high of a RPM, is what causes the most damage. I know my Dad and My Uncle had some Big Twins from the Late 50s where they would swap the Forward...
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