Kohler CH5 / CH6 — Carburetor Adjustment
Adjustments
For the Kohler CH5 / CH6, from the Kohler service manual.
Applies to: Kohler CH6
Before you start
- Carburetor adjustments only after engine has warmed up
Procedure
- With engine stopped, turn low idle fuel needle in until it bottoms lightly (also main fuel needle on adjustable type).
- Preliminary settings: idle fuel 1-1/4 turns open; main fuel 1-1/8 turns open (adjustable type only).
- Start engine, run at half throttle 5-10 minutes to warm up.
- Main fuel setting (adjustable type only): turn main fuel needle clockwise until speed decreases, then back out about 1/4 turn.
- Low idle speed: set to 1200 (+/- 75) RPM; must not exceed 1500 RPM.
- Low idle fuel: set needle midway between rich and lean.
- On constant speed applications turn low idle fuel needle out 1-1/4 turns and leave.
Tools required
- Tachometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Low idle speed 1200 (+/- 75) RPM
- Low idle must not exceed 1500 RPM
Full service-parts list: Kohler CH6 →
Source: Kohler service 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.