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  1. jimmbo

    2021 Mercury 115 Pro XS cavitating

    A pic at that height from behind would be handy, as it looks like your hull has a Setback transom. Height should be easy to adjust as you have a Jackplate
  2. jimmbo

    1996 Evinrude V6 150 (60 deg) Looper Problems

    The concept of the Spark being used to set the Idle Speed, goes over a lot of heads. They are thinking on what they did on cars/trucks to tune them
  3. jimmbo

    1959 Evinrude Fat Boy 50hp

    1/3 the fuel was burned, 1/3 was pushed out the Exhaust, and the last 1/3 was dumped via the Crankcase Purge Valves
  4. jimmbo

    1959 Evinrude Fat Boy 50hp

    Some pics of a Fat 50 I found a few years ago
  5. jimmbo

    Are all 9.9 carbs the same from 93 to 95 to 98

    Find a Site that has the Parts Catalogs, and check each Year
  6. jimmbo

    50hp Mercury 2stroke issues

    Start with a Compression and Spark Test. Spark has to be able to jump a 7/16" gap
  7. jimmbo

    1959 Evinrude Fat Boy 50hp

    Here is a link to a 3rd Party Service Manual(one of the Better ones), it is a PDF, so it can be downloaded. http://www.fiberglassics.com/library/images/9/91/Evinrudeservice003.pdf You might have to resort to using an Inductive Tachometer. If you feel you need one to pick a prop, not to worry...
  8. jimmbo

    1959 Evinrude Fat Boy 50hp

    Yes, Tachs were used on Magneto Ignitions for Decades
  9. jimmbo

    1990 5.7. 260 Overcooling at idle.

    I will bet the Highest Temps alternate between the Port and Starboard sides of the intake. Engines often do that instead of Being uniform and even temps.
  10. jimmbo

    1990 5.7. 260 Overcooling at idle.

    Get a Temp reading gun and aim it at the Water passages on the Intake Manifold and see what the Temps are
  11. jimmbo

    1990 5.7. 260 Overcooling at idle.

    The Lid and Base Stampings are USCG approved, but the Media... That oily media should burn well when the Flames hit it
  12. jimmbo

    Novice Boat Owner With Possible Issues On Johnson 1976 115HP

    Drop the Lower Unit and inspect water pump, replace the Impeller. Should be the first thing done, anytime someone buys a used motor
  13. jimmbo

    Novice Boat Owner With Possible Issues On Johnson 1976 115HP

    Did water come out of the Prop?
  14. jimmbo

    Novice Boat Owner With Possible Issues On Johnson 1976 115HP

    Those will spill water out once the chamber around the Exhaust Tube fill ups
  15. jimmbo

    Novice Boat Owner With Possible Issues On Johnson 1976 115HP

    By outlet, are you referring to the two round Idle Reliefs about 5 inches below the Cowl?
  16. jimmbo

    70 hp Johnson wont accelerate

    The 70 was produced for many more years than that, till at least 2000
  17. jimmbo

    Lake boat sizes: Is there a trailerable sweet spot?

    They do a bit better in Rough Conditions, but even they get thrown around enough to break the Bones of the Drivers
  18. jimmbo

    70 hp Johnson wont accelerate

    You can test the Pressure the Fuel Pump is putting out. It is not very high at the best of times. Most bog problems with these engines are Leanness. Low Fuel Level in carb(s), lean idle adjustment, dirt/gum/varnish in the carb. You had the Carbs off, incorrect sync between the Carbs and also the...
  19. jimmbo

    Lake boat sizes: Is there a trailerable sweet spot?

    Michigan, like the other Great Lakes, need to be treated and respected for what they are, small Oceans. They certainly have enough Shipwrecks on their Bottoms to drive that point home
  20. jimmbo

    70 hp Johnson wont accelerate

    That is an 83 Evinrude
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