Kohler — Adjusting Low Idle Fuel and Speed
Adjustments · carburetor
From a Kohler service manual covering: CV17, CV18, CV20, CV22, CV23, CV25, CV26, CV730, CV740, CV745. Check it applies to your exact model before use.
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Before you start
- Carburetor adjustments should be made only after the engine has warmed up.
Procedure
- With engine stopped, turn low idle fuel adjusting needle in clockwise until it bottoms lightly.
- Preliminary setting: turn adjusting needle out counterclockwise 2-1/4 turns from lightly bottomed.
- Start engine and run at half throttle 5 to 10 minutes to warm up.
- Place throttle control in idle/slow position and set low idle speed to 1200 RPM (±75 RPM) using tachometer.
- Turn low idle fuel adjusting needle in slowly until engine speed decreases, then back out 3/4 to 1 turn.
- Recheck idle speed with tachometer and readjust as necessary.
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 RPM ± 75 RPM
- Initial needle setting 2-1/4 turns out
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.