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  1. jimmbo

    Choosing first prop to run .

    Flexes. That bit of Misinformation has sold many SS Props. In reality, the Blade is very rigid, and the Water will yield far sooner than the Blade. Lock a set of ViseGrips on a Blade and try flexing it. It is more likely to Crack than flex.
  2. jimmbo

    Choosing first prop to run .

    If the Rpm is low with a 11 1/2, it will be a lot lower with the 14 While our Ears are very good at detecting a Frequency Change/Shift, they are not very good at actually measuring the Frequency. A Tach is needed when evaluating/choosing a Prop WOT Range for that engine is 4000-5000 rpm In 72 my...
  3. jimmbo

    Surface drive propeller

    Welcome to iboats Most Outboard Props are not designed for operating Partially Submerged, and are also designed to have Exhaust expelled through them, which is not going to happen when used on a Surface Drive.
  4. jimmbo

    Old Evinrude question, Can anyone help?

    My dad had a 57 35hp, and then 63 Johnson Eletramatic, but it had a 66 40hp Electric Start Cowl. The guy we bought it from had another 40hp, and likely swapped the Cowls, cause the Electramatics were decked out a bit Fancier The pic was taken 49 yrs ago, to the Day, about a week after I first...
  5. jimmbo

    VP 4.3GS Carb Tuning Vacuum Port?

    Instead of having to drill holes in the Throttle Plate, Holley, on a lot of 4 bbls, has an Adjustable Stop on the Secondaries
  6. jimmbo

    Chrysler 55 one cylinder occasionally fires

    Based on the lack of an 8 in the model #, I would say that your motor is a 1969 5542 55 55hp 4 is for 15" Shaft, Electric Start 2 is Canadian Manufactured
  7. jimmbo

    Old Evinrude question, Can anyone help?

  8. jimmbo

    Old Evinrude question, Can anyone help?

    Post a pic of the engine with a the Port side of the Cowl open. It might help me with Guestamating the Yr
  9. jimmbo

    Old Evinrude question, Can anyone help?

    A 40hp Lark would never look like that. It would have had a Fiberglass Cowl
  10. jimmbo

    Sea foam for outboards?

    Yeah, the Corn Farmers Lobby hoodwinked the Government into thinking Ethanol is good for Cars/Trucks.
  11. jimmbo

    Fiberglass cracking - BRAND NEW R4 Surf 2023

    Gelcoat is not very flexible and cracks easy as there is no Glass to take any load. It also help reveal Structural Problems, and I suspect your boat has problems with lack of Resin in the Glass, or just not enough Laminations to provide rigidity. Take it back to the Dealer and insist on a New...
  12. jimmbo

    Sea foam for outboards?

    You may have a slightly sticky Valve, and there was some Lash in the Valve Train. There is no connection between the Lifters and and Induction System
  13. jimmbo

    Chrysler 55 one cylinder occasionally fires

    You say the one Cylinder will fire, until the wire/boot is placed on the Plug? Maybe there is a Carbon Track or Crack in the Porcelain. Try a new Plug. Also try to clean the inside of the Boot of any carbon/dirt
  14. jimmbo

    NGK BUHW 2622 spark plug replacement?

    So did mine, even when I refused to get a new Battery, it would fire right up, usually only taking 2 tries using the Rope around the Flywheel on a cold Start. It was good motor
  15. jimmbo

    NGK BUHW 2622 spark plug replacement?

    Every 2 yrs? Gee, I had about 800hr on my 84 115, and it still had the factory installed NGKs in it when I traded it in 1998
  16. jimmbo

    Sea foam for outboards?

    I'm not in the US
  17. jimmbo

    Sea foam for outboards?

    I didn't realize that the Lifters were accessible via the Induction System. I guess I learned something New today... I remember a bunch of lawsuits against Slick 50 over damaged Engines
  18. jimmbo

    Need 100 hp manual

    Videos, I would hope that the one Posting actually knows what he/she is doing. Some don't, but hey, it is Youtube. I would say try Ken Cook for the Manual https://www.outboardbooks.com/
  19. jimmbo

    Sea foam for outboards?

    It was certainly making all the Carbon that was being expelled. Whether or not ATF is good Solvent, I can't say I have ever seen any shop using it as a Parts Soak, except for new Clutch Plates/Bands for Auto Transmission rebuilds. I heard of people putting a couple of Cans of ATF into the...
  20. jimmbo

    Sea foam for outboards?

    Read Post #14
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