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  1. 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.
  2. jimmbo

    Prop change on my bowrider

    The Enertia came out 20 years ago. I bought mine in 2005
  3. 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
  4. jimmbo

    Reduced speed under load

    The 1973 50hp, Electric Start, uses a Hydro-Mechanical Shift Gearcase
  5. 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
  6. 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.
  7. jimmbo

    Reduced speed under load

    A 73 has an entirely different Gearcase than a 75. What is the Diameter of the Prop?
  8. 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...
  9. jimmbo

    99 Volvo 5.0GL

    https://www.marineengine.com/newparts/part_search.php?part_num=3858261
  10. jimmbo

    18 or 25? Anyway to tell?

    The Cowl Cover looks like a 1969(based on the Graphic on the Back of the Cowl) . The Recoil looks like it was from a Johnson Motor. Maybe the Transom Bracket was replaced, or the entire Powerhead and Cowl were placed on a 73 Midsection. It looks like some Sketchy Glass Repair on the Transom, in...
  11. jimmbo

    18 or 25? Anyway to tell?

    When I look at the 1973 Parts Lists, I see different Part #s for the 18/20 and the 25hp Carbs Pics of your Frankinrude, would be nice
  12. jimmbo

    18 or 25? Anyway to tell?

    If those parts from a 25 are installed on an 18/20hp, the engine can be ruined. Putting the 25hp Head on an 18/20hp, without changing the Pistons will result in too much Compression and Detonation will occur. Putting the Carb and Intake for a 25 on an 18/20 without the Piston and Head Changes...
  13. jimmbo

    18 or 25? Anyway to tell?

    That Jet is used in the 25hp Carb The differences between the 22 cubic Inch 18/20hp and the 25hp are: 1)Pistons - Relocation of the Wrist Pin, changes the Port Timing, and lowers Compression 2)Cylinder Head - Restores Compression 3)Intake Manifold - Required for the Larger Carb 4)Carb - Larger...
  14. jimmbo

    Evinrude big twin 40

    I am of the mind that the Engine could run too Hot without the Stat, because of the Removal of the Associated Parts affecting the Water Flow Patterns. However, it is your Motor, so can do whatever you want with it...
  15. jimmbo

    Evinrude big twin 40

    Get a new Stat
  16. jimmbo

    Found some rocks with my prop...

    That Number(0522) stamped on the Hub, is likely a Repair Work Order #, and the Prop looks like it has been repainted
  17. jimmbo

    Found some rocks with my prop...

    That Prop has been repaired before
  18. jimmbo

    Found some rocks with my prop...

    The Body Dolly, or other Backing Plate is an Important Part of trying to straighten any Piece of bent Metal
  19. jimmbo

    Evinrude big twin 40

    Without the Stat, the Housing, the Ball and Spring, the Intended Water Flow Pattern compromised. The Spring maintains an approximate 1 Psi in the Cooling System when the Stat is Closed, but the Pressure from the Pump is higher, so the valve opens and the Water is sent back to the Pump, when the...
  20. jimmbo

    Evinrude big twin 40

    The stat is supposed to start opening around 138F. As I said it does use a Recirculating System, which is why there are two Pipes going to the Water Pump. Have you taken that Cover, #28 on the Exploded Gearcase? I have found Crap in there, and it starved the Pump. How long have you owned this...
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