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jimmbo replied to the thread 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...

Aug 22, 2025
jimmbo replied to the thread 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...

Aug 21, 2025
jimmbo replied to the thread 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...

Aug 21, 2025
jimmbo replied to the thread Prop change on my bowrider.

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

Aug 20, 2025
jimmbo replied to the thread 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...

Aug 18, 2025
jimmbo replied to the thread Reduced speed under load.

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

Aug 18, 2025
jimmbo replied to the thread 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

Aug 18, 2025
jimmbo replied to the thread 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.

Aug 18, 2025
jimmbo replied to the thread Reduced speed under load.

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

Aug 18, 2025
jimmbo replied to the thread 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...

Aug 18, 2025
jimmbo replied to the thread 99 Volvo 5.0GL.

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

Aug 17, 2025
jimmbo replied to the thread 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...

Aug 16, 2025
jimmbo replied to the thread 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

Aug 15, 2025
jimmbo replied to the thread 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...

Aug 15, 2025
jimmbo replied to the thread 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...

Aug 15, 2025

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