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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 26059
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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I have a Kohler CV16S motor on my Craftsman riding lawn

Customer Question

I have a Kohler CV16S motor on my Craftsman riding lawn mower. I bought a Kohler Kit 12-757=03-S to rebuild and clean the carburetor. There is a small o-ring in this kit which I can't find a location for. Does anyone have any idea what it might be for?
Submitted: 4 months ago.
Category: Small Engine
Expert:  Curtis B. replied 4 months ago.

See page 5.6 in the manual above. Do you see it? Not the seal on the throttle shaft?

Customer: replied 4 months ago.
I have a cap for the FUEL SHUT OFF SOLENOID and a smaller "o-ring" which might be the "FUEL INLET SEAT" for the FUEL INLET NEEDLE". If that's it, does it just slip onto the "NEEDLE"? The original Kohler had two - one was in a separate sealed bag "Use 82-85 inlet nedle valve in carburetors that have a brass valve seat and dated after 2553 (?).
Expert:  Curtis B. replied 4 months ago.

Fuel inlet seat is a squarish o'ring that goes in the upper passage for an all metal needle, it is not used in model with a rubber tipped needle.

Customer: replied 4 months ago.
I'll send a picture shortly
Expert:  Curtis B. replied 4 months ago.

OK>

Customer: replied 4 months ago.
The one on the left is original - 2nd from the left was loose - 3rd from the left was 82-85 inlet needle valve described earlier - the oring is on the right.
Expert:  Curtis B. replied 4 months ago.

O'ring would go in the upper passage , where all metal needle valve would seat on it. It has to be tight in the upper housing, so it does not fall out.

Customer: replied 4 months ago.
how far down does it go? flush?
Expert:  Curtis B. replied 4 months ago.

Ithas to bottom out in the passage, Use a drill bit end or a wooden dowel to seat it.

Customer: replied 4 months ago.
I'll give it a try here shortly, use 2nd from the left in the picture?
Expert:  Curtis B. replied 4 months ago.

One will fit the opening better, you want it close, but has to be loose. The one on the right or the center one , either will work with the upper seat.

Customer: replied 4 months ago.
Any tricks on getting it started?
I have a 5/32" flat end punch to seat it....
Expert:  Curtis B. replied 4 months ago.

Did it have one before? Just pinch the seal and slip it into the passage, then straighten it up and push it in.

Customer: replied 4 months ago.
I don't think it did - with the thing seeing probably some ethanol (I bought this tractor at a garage sale) it could have been eaten away, but I doubt it.....
Expert:  Curtis B. replied 4 months ago.

If it has an all metal needle and not the rubber tipped needle, it has to have the upper seat.

Customer: replied 4 months ago.
I'll keep trying
Expert:  Curtis B. replied 4 months ago.

OK>

Customer: replied 4 months ago.
With the seat installed, the FUEL INLET VALVE won't go down far enough to install the float.
Expert:  Curtis B. replied 4 months ago.

You got it bottomed out? You have the needle installed correctly in the float, where float holds needle and needle not on the top of the tab? The fork on the float has to hold the needle by the groove in the top of it.

Customer: replied 4 months ago.
Oring bottomed out, yes installed as you described on the float.
Expert:  Curtis B. replied 4 months ago.

OK< and the needle is all metal and has no rubber tip? What happened to the original, as it has no tip?

Customer: replied 4 months ago.
I took the carburetor apart and soaked overnight in acetone. That's what it looked like. There was nothing resembling a rubber tip in the residual acetone solution which darkened in color.
Customer: replied 4 months ago.
I am going to remove the fuel needle valve seal. The 'thinner' needle (under 'magnifying glass' appears to have an attached tip (not a solid piece).
Expert:  Curtis B. replied 4 months ago.

Ok, then you use it less the seat!

Customer: replied 4 months ago.
Are you still there?
Expert:  Curtis B. replied 4 months ago.

Yes, I'm here

Expert:  Curtis B. replied 4 months ago.

I never left, Not sure why your response just now popped up!

Expert:  Curtis B. replied 4 months ago.

I see question is still open, did you get the needle worked out?

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