Kohler — Gasoline Carburetor Main and Idle Fuel Mixture Adjustment
Adjustments
From a Kohler operator's manual covering: 4CFKM, 4CFKM/CFKMR, 4CKM, 4CKM/CKMR, 5CKM, 5CKM/CKMR, TP-5393. Check it applies to your exact model before use.
Applies to: Kohler 4 and 5 kW, Kohler 4CFKM, Kohler 4CKM, Kohler 5CKM, Kohler M18 / M20 engine, Kohler M18 engine, Kohler M20 engine
Before you start
- Damage to needles and seats will result if the needles are forced.
Procedure
- Stop engine and turn main fuel and idle fuel adjusting needles in until they bottom lightly.
- Back out main fuel needle 2 1/4 turns and idle fuel needle 1 1/2 turns.
- Start engine and run at half-load for 5-10 minutes to warm up.
- At 3/4 to full load, turn main fuel needle in until engine does not operate smoothly; note position.
- Turn the main fuel needle out 1/4 turn.
- Set idle fuel needle using the same procedure.
Specs & values
- Main Fuel Needle preliminary 2 1/4 turns
- Idle Fuel Needle preliminary 1 1/2 turns
Full service-parts list: Kohler 4 and 5 kW →, Kohler 4CFKM →, Kohler 4CKM →, Kohler 5CKM →
Source: Kohler operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.