Kohler — Carburetor Adjustment

A Kohler service procedure — check it applies to your exact model before use.

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Procedure

1. 1. With the engine stopped, turn the low idle fuel adjusting needle in until it bottoms lightly. On engines with adjustable main fuel, also turn the main fuel adjusting needle all the way in until it bottoms lightly.
2. 2. Preliminary Settings: Turn the needle (or needles) counterclockwise from lightly bottomed to the positions listed: IDLE FUEL ~ 1-1/4 TURNS OPEN, MAIN FUEL — 1-1/8 TURNS OPEN (adjustable type only)
3. 3. Start the engine and allow it to run at half throttle for five to ten minutes to warm up. If possible, place the engine under load while adjusting.
4. 4. Main Fuel Needle Setting: This adjustment is required only for adjustable main jet carburetors. Place the throttle into the fast position. Slowly turn the main fuel needle in clockwise direction until the engine speed decreases then back it out about 1/4 turn for best high speed performance.
5. 5. Low Idle Speed Setting: Place the throttle into the idle or slow position and check RPM with a tachometer. Turn the low idle speed adjusting screw in or out until the desired speed is attained.
6. 6. Low Idle Fuel Setting: Move throttle into idle or slow position then turn the low idle fuel needle out (counterclockwise) from the preliminary setting until the engine speed decreases (rich) then turn it back in (clockwise) until it again increases then decreases (lean) then set the needle midway between the rich and lean settings.
7. 7. After adjusting, recheck low idle speed with a tachometer and reset as needed.

Source: manual:tp_2337_a.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.