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  1. jimmbo

    Trouble launch and loading boat

    Can't be. In 1980 OMC went to a different Gearcase, where the Water Inlets were further back on the Gearcase. The Cases aren't swappable as the Shift Linkage is different.
  2. jimmbo

    Prop Swap opinions...

    Is that 4500rpm, fully loaded or lightly loaded? A 22ft is asking a lot of a 4.3, even a 5 liter. Even if you underprop it noticeably, the Hole Shot is still gonna be less than neck snapping. To me you are already close to being over propped and a 3 blade 17 might be a better choice, that will...
  3. jimmbo

    Trouble launch and loading boat

    What year is the Boat? The Motor is a 77- 79 35 Hp
  4. jimmbo

    2 stroke longevity?

    It is the Environmental Protection Agency, and Water is part of the Environment, and Food, which we eat relies on the Environment.... When viewed from a 100,000 miles away, our little Planet, is just that, A little Oasis in the Dark Vast Emptiness of Space. It is our ONLY Home
  5. jimmbo

    2 stroke longevity?

    I do like having Air that isn't full of Unburned Fuel, Carbon Monoxide, and Oxides of Nitrogen, and I suspect the EPA clamped down further Increases of those being introduced into the Watersheds.
  6. jimmbo

    Trouble launch and loading boat

    If the Axle was under the Transom, then Half the Weight of the Boat and Trailer would be on the Hitch
  7. jimmbo

    2 stroke longevity?

    Far fewer Parts in a 2 stroke to fail/wear. There are tens of thousands of 2 Stroke Motors from the 50s still running, and have never been apart. I doubt that in 20 yrs there will be many of the current 4 Strokes still running, the original Powerheads
  8. jimmbo

    Trouble launch and loading boat

    "Runner V" ????? You say the Ramp shallows out. Your Trailer is lower at the Front when hitched to your Tow Vehicle, so maybe you are trying to back the Boat Uphill when coming off the Trailer, if the Ramp is really Flat. Raising the front of the Bunks and the Rollers forward of it, might...
  9. jimmbo

    Trouble launch and loading boat

    Trailer is way too small for that boat, and that is putting the Hull at risk of Deformation.
  10. jimmbo

    2 stroke longevity?

    You got that backwards
  11. jimmbo

    If you're wondering if your anti siphon valve is stuck, or clogged, here's a test....

    The one on my Boat was stuck closed when I took it out the First Time. Engine had been run from a Separate Tank at the Dealer during Prep. That Valve no longer exists in my boat
  12. jimmbo

    head swap

    Well the Exhaust Tuner in the Midsection is a different Part #. Same goes for the Exhaust Housing Adapter(might have something to do with the Tuned Exhaust)
  13. jimmbo

    Prop change on my bowrider

    The Trailing Edge of the Cup, should be Sharp and Abrupt. the Water will separate Cleanly. Any Rounding of the Edge will cause the Water at attempt to Curl around it, and that will increase Drag.
  14. jimmbo

    Prop change on my bowrider

    The Enertia came out 20 years ago. I bought mine in 2005
  15. jimmbo

    Prop change on my bowrider

    I would try a 3 blade 21. I suspect with the Gearing on a 4.3, it probably came with a 21, but the previous Owner wanted better Hole Shot, and stuck 19 on it
  16. jimmbo

    Reduced speed under load

    The 1973 50hp, Electric Start, uses a Hydro-Mechanical Shift Gearcase
  17. jimmbo

    Can you convert a 20HP Johnny to 35HP with a carb and intake manifold?

    Same Displacement does not mean it is the Same Block. Porting may be Different
  18. jimmbo

    Retaining ring on1975? Johnson

    If you are referring to a 20hp, it is basically the same as an 18hp. It was made well into the Late 70s.
  19. jimmbo

    Reduced speed under load

    A 73 has an entirely different Gearcase than a 75. What is the Diameter of the Prop?
  20. jimmbo

    Reduced speed under load

    That Mixture Adjuster, only adjusts the Idle Mixture. As other have said, it appears to be a Case of Dirty Carb(s), however. Is the Spark on each Cylinder, strong enough to jump a 3/8" Gap? If you clean the Carbs, once they are Reinstalled, you will have to so a Check of, and perhaps Adjust...
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