what goes hear? on this omc

[Fast Fred]

any body know what goes in the hole in the center, between the main studs,
never seen one before, but needs some thin thare.

[Jeff Akers]

looks like you need a "banjo bolt" ( a bolt with holes in it so it can pass fluid through it) usually has a copper washer on both sides of what its bolting through.

[Boatwrx]

Fred, The hole you are refering to is actually the idle mixture adjustment, I guess you can call it a remote circuit of the carburetor. If you plug it up the engine will not idle. The high speed adjustment is on top of the tank and if you pump that screw it primes the engine for cold starting. This should be a TN model. Hope this helps.

Ken
Boatwrx
Boulder, CO

[mac19f]

It is a complete separate carbureter. It is rotary ported and functions as the low speed carbureter. The side carbureter has no idle circuit and is for high speed only.

[Jeff Akers]

Fred, The hole you are refering to is actually the idle mixture adjustment, I guess you can call it a remote circuit of the carburetor. If you plug it up the engine will not idle. The high speed adjustment is on top of the tank and if you pump that screw it primes the engine for cold starting. This should be a TN model. Hope this helps.

Ken
Boatwrx
Boulder, CO

It is a complete separate carbureter. It is rotary ported and functions as the low speed carbureter. The side carbureter has no idle circuit and is for high speed only.

Fred, I think these guys are on to somthing........being wrong about this dose make me feel a little younger though LOL!


I'ts nice to see other shops working on the old engines.....I'm doing service on a 1950 merc myself........don't need my laptop for that !

[DKL]

Correct,, nothing goes in the hole,,, I have one also mine has the neutral and it is a TN 28 5 HP 1952-3
yours could be a TN25--26 1950

look on the block ,,,its stamped with the number.

I have a book and can look up most pre 1965 motors for yr. built with serial or model # PM if I can help anyone

[Fast Fred]

when i pumped the primer, gas was shootin outa thareso was thinkin she was missin somethin, i was think banjo, but thers no treds in thare.

[Jeff Akers]

.........

[Skoontz]

Fred:

What you got is the smoothest idleing Johnson ever made, with the exception of the 2.5 hp rotary valve engine of late 40's early 50's. Nothing goes in the hole, it is used to mix air to the idle adjustment, and acts as a bypass for the float tank. If you have a carb running too lean, dirty, of filled with crapola, no matter where you place the idle adjustment screw, it will fart out the hole, usually vaporized gas/air mix. Carb parts were non existent in the 70's for them, and we ended up using exacto knives for gaskets, matching o rings for packing, all kinds of fun stuff such as that.

If you can mangae to dial in the carb, you can almost count the pops when the engine fires. Lowest we ever got one down is 330 RPM and still kept running. Let us know how that bad boy runs after you dial it in will ya???

[mercguy]

Fred, I think these guys are on to somthing........being wrong about this dose make me feel a little younger though LOL!


I'ts nice to see other shops working on the old engines.....I'm doing service on a 1950 merc myself........don't need my laptop for that !

oh god, what has the world come to?? Jeff is working on a REAL OUTBOARD..........MERCURY!!!!!!!

I know where you can plug in the laptop though.........

PS: you definately do not have to worry about updating the EMM on that KF7!