Carburettors for K Series

[andrewLL 30]

Hi, is there someone that could run through a K Series carb and explain what all the bits do and how the air and fuel flow through it. Is there a cut away drawing showing what is what? When you look closely they are a bit more complex than they first appear with some very small holes which I assume are what get blocked and cause problems.

 

I have two to rebuild and two new ‘Chinese’ replacements.  I have been running a Chinese one for about seven  years now without any problems, I know some of you aren’t very impressed with them.

 

I have marked the holes in the main casting that I have found so far.  There is a large hole at the bottom on the front where on occasions a little fuel has leaked out of (blue arrow). There is then a larger hole on the right (red arrow) and a small hole at the start of the venturi (yellow arrow).  On the engine side of the carb there is a row of three tiny holes with another above them.  The needle is hollow with a two small holes at the bottom, then four in the middle and four more at the top between two threaded sections. I notice that the Chinese carb that I am using only has one hole at the bottom and it works ok.

 

hoping some one can explain, thanks, Andrew. 

[ri702bill 11,089]

Good info on carbs in the Kohler K Series Manual...

 

KohlerKseriesManual.pdf

[WHX?? 54,193]

Big Unit @ebinmaine ain't too shabby with oem carbs. 

[AlexR 2,441]

For your original carbs, get the genuine rebuild kit from Kohler it's available on Amazon among other places just know that if it's a newer production it will have Rehlko on it I thought I got ripped off for minute until I realized that is Kohlers new name haha

 

KOHLER 25 757 01-S

 

Second is try to move the throttle shaft side to side all the way around and see how much play is there, if it's too loose you will need to install some bushings. This is not a option if you want a good running engine. 

 

Hillman Group 58087 Thrust Bearing, Bronze 1/4 X 7/16 X 1/16

You will need two of these as you will have to stack 2 on top of each other. 

 

If you are lucky you will have a removable ball stud assembly on the throttle shaft that you can remove to get the bushings in. If not you will have to remove the throttle plate. The brass screws on there are peened on the back side so you may have to grind away part of the screw with a Dremel prior to trying to remove them. I have been able to remove them without doing that, but its always a risk. 

Replacement screw size is #3-48 x 1/4"

DO NOT reuse the original screws. 

You can either get brass screws again and peen them or get stainless screws with lock washer's and loctite.