Carb float setting Kohler Command 18

[Mike McKown]

Originally Posted by Shrewcub

The correct float height adjustment is 22 mm (0.86 in) measured from the float bottom to the air horn casting.

Note: Be sure to measure from the casting surface, not the rubber gasket surface.

Follow up question. This is a spring loaded needle valve. Is the measurement taken with the spring compressed a little from the weight of the float or is the measurement taken with the spring fully compressed?

I've adjusted this float several times. Blown the carb several times even though it is clean. Cleaned the slow jet with a wire and installed new O rings.

I'm still getting a rich low speed mixture. Maybe be rich on the fast side but it's not obvious.

[mickb72]

Originally Posted by Mike McKown

Follow up question. This is a spring loaded needle valve. Is the measurement taken with the spring compressed a little from the weight of the float or is the measurement taken with the spring fully compressed?

I've adjusted this float several times. Blown the carb several times even though it is clean. Cleaned the slow jet with a wire and installed new O rings.

I'm still getting a rich low speed mixture. Maybe be rich on the fast side but it's not obvious.

May not be the carb. That's the way they act with a blown head gasket. Either into the oil galley or oil return hole. They end up acting rich and fouling plugs and missing. Mike

[Terry C]

It's a non adjustable low speed then? I know I did my float by trial nad error.
If I remember right you need to compress st least half that spring. It will look like the level will be too low by looking at the float.

[J-Mech]

The measurement will be with the spring compressed fully. Just like the measurement on a carb without a spring loaded needle. Float setting at valve fully closed.

Terry, the low speed is adjustable. High speed jet is fixed orifice.


Mike, so, your saying that you can screw in the idle mixture screw all the way and it's still rich?

[Mike McKown]

Originally Posted by J-Mech

The measurement will be with the spring compressed fully.

Mike, so, your saying that you can screw in the idle mixture screw all the way and it's still rich?

I'll reset the float after while with the spring compressed. I've not done it that way before. Then I'll check out the idle mixture adjustment and see if I can control the mixture.

[Shrewcub]

Originally Posted by Mike McKown

Follow up question. This is a spring loaded needle valve. Is the measurement taken with the spring compressed a little from the weight of the float or is the measurement taken with the spring fully compressed?

I've adjusted this float several times. Blown the carb several times even though it is clean. Cleaned the slow jet with a wire and installed new O rings.

I'm still getting a rich low speed mixture. Maybe be rich on the fast side but it's not obvious.

Sorry, I should have posted step 5 also.

Hold the carburetor upper body so that the float assembly hangs vertically and rests lightly against the fuel inlet needle. The fuel inlet needle should be fully seated, but the needle tip should be not be depressed. See Figure 5-10

Note: the fuel inlet needle tip is spring loaded. Make sure the float assembly rests against the fuel inlet needle without depressing the tip.

[J-Mech]

Travis, what manual is that from?

[Shrewcub]

This one here.

[J-Mech]

Huh. What is the book number? I have a PDF copy of the CH service manual, but it does not go into carb break down like that. Pretty vague really. But it is the book Kohler offers. Wonder if they had different manual and went to a "one size fits all" for the PDF.

[Shrewcub]

FORM NO.: TP-2428-C

ISSUED: 4/92

REVISED: 3/06

I got this with my 1864.