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  1. jimmbo

    What do these 2 rubber hoses go to?

    Maybe a Previous Owner needed an Extremely Stealthy Motor and the Idle Relief was giving him/her away... I have seen many Motors butchered over the Years, and can count on less than One Hand, an actual Improvement over Stock.
  2. jimmbo

    Any saving the engine? I’m devastated

    I guess if the OP is willing to buy a Starter in a yr or so, and looks forward to having to Rope Start the Motor, or Paddle home, he doesn't Need to take it apart, clean and lube it
  3. jimmbo

    Any saving the engine? I’m devastated

    The questioning about it running when it got wet, is because engines that are running can suffer very serious damage, as Water is not Compressible, and if enough were to get into the Cylinder, the Engine would literally stop Instantly, even at 5000 Rpm. Bent/Broken Con Rods, Crankshafts, Pistons...
  4. jimmbo

    4.3 Carb…What’s That Hose?

    You will likely find that the other end of that hose goes to the Fuel Pump, and is there to prevent any Fuel from a leaking Pump Diaphragm, spilling into the Bilge, by diverting it to the Carb. By now the Hose is likely stiff and inflexible, and should be replaced. Again, getting the Hose from...
  5. jimmbo

    Any saving the engine? I’m devastated

    Great to hear Did any water drain from the Carb Bowls, or spray out the Spark Plug Holes? You have to run it for quite a while, to make sure all the Water has either been thrown out of the Bearings, or has evaporated. The Lower Crank Shaft Bearing is the most Vulnerable as the Water can't drop...
  6. jimmbo

    Any saving the engine? I’m devastated

    And keep it running for at least an hour Spraying some Engine Cleaner(BRP) or PowerTune(Merc) into the Carbs when running, will help flush out Water from the Bearings,
  7. jimmbo

    Any saving the engine? I’m devastated

    #36 is the Drain Screw of the Carb Bowl
  8. jimmbo

    1977 merc 150 outboard bogs at WOT

    To get the revs up to 5800, a 17" is likely the Pitch that is going to be needed. The 150 runs great from 4000 to 5800, but below 4000, it can be an unhappy camper.
  9. jimmbo

    1977 merc 150 outboard bogs at WOT

    First thing is a Compression Test Next, does the Ignition System, provide a Spark strong enough to Jump a 3/8" Gap at all Plug Wires? Did you set the Floats correctly? After you replaced the Carbs, did you verify the Link and Sync between the Spark Advance and Carbs, and adjust to spec if...
  10. jimmbo

    video of my motor idling

    That is why the Correct Service Manual is Important. But the basis is, the timing is required to be at a Specific Point, where the Carb(s) are still closed, but the slightest advance of the Timing, will be the start of the Carb opening, ever so slightly. And the all Timing Advance will also be...
  11. jimmbo

    OK for the spark plug gap to be slightly off from recommended?

    The NGKs that came in my 84 115 when new, were still in it in 1998, with 700hrs on them, when I traded the Boat and Motor on a new one
  12. jimmbo

    blue -v- brown band

    That Cowl Decal was used1980 thru 1983
  13. jimmbo

    blue -v- brown band

    1983 and older 115s would have the Pump in the Boat TNT That is one of the Joys of Mercs for many yrs, as the variations of the Decals were often slight, over the years.
  14. jimmbo

    blue -v- brown band

    Brown was used in 1984 and 85. They dropped the Compression a bit after 83 1982 was the Year Mercury started Prop Rating all 6 cylinder engines However some late 81s might be Prop Rated Any 115 with a Serial Number up to and including 5050763 would be Crank Rated 5050764 and above would be Prop...
  15. jimmbo

    85hp 3 cylinder Force carburetor throttle plates.

    The Butterflies are to all be Fully Closed at Idle. Once the linkages between are tightened, they will all open the same amount, and there is an Stop to limit their opening. Idle Speed is set simply by adjusting how far the Timing is retarded Just out of Curiosity.... What Service Manual are you...
  16. jimmbo

    Help with prop ID (pics)

    That is an Old Prop, it looks likes an Uncupped Prop, and has been rebuilt at least twice
  17. jimmbo

    Awfull time launch & retrieve roller trailer

    deleted
  18. jimmbo

    Awfull time launch & retrieve roller trailer

    One of the front Rollers is missing the Retainer
  19. jimmbo

    Need to determine best prop for weird setup

    The 1.51 was used with the 5.7. It is what my Motor has Going from a 21" 4 blade to a 17" 3 blade, should have shown an increase of at least 1000 rpm Top Speed, would only be a couple of Mph difference
  20. jimmbo

    Older motor

    1960 was the Only year that the 75 used that Cowl Shape.
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