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Home›Repair guides›Kohler›Low Idle Fuel Adjustment

Kohler — Low Idle Fuel Adjustment

Adjustments · carburetor

From a Kohler service manual covering: CH18, CH20, CH22, CH23, CH25, CH620, CH621, CH640, CH641, CH670, CH680, CH730…. Check it applies to your exact model before use.

Applies to: Kohler CH18

Before you start

  • Engines have fixed low idle or limiter caps; do not attempt to remove limiter caps.

Procedure

  1. Place throttle into idle/slow position. Adjust low idle speed to 1200 RPM.
  2. Turn 1 low idle fuel adjusting needle out (counterclockwise) until engine speed decreases (rich). Note position.
  3. Turn adjusting needle in (clockwise) until speed decreases again (lean). Note position.
  4. Set adjusting needle midway between rich and lean settings.
  5. Repeat for other low idle adjustment needle (two-barrel carburetor only).
  6. Recheck/adjust Low Idle Speed (RPM) to specified setting.

Specs & values

  • 1200 RPM

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.

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