Kohler — Adjust Low Idle Fuel and Speed
Adjustments · Carburetor
From a Kohler service manual covering: CV17, CV17-745, 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.
- Certified engines may have a fixed idle or limiter cap; do not attempt steps 1 and 2.
Procedure
- With engine stopped, turn the low idle fuel adjusting needle in (clockwise) until lightly bottomed.
- Preliminary setting: turn the needle out (counterclockwise) 2-1/4 turns from lightly bottomed.
- Run engine at half throttle 5-10 minutes to warm up; verify throttle and choke plates fully open.
- Low idle speed: place throttle in idle/slow; set low idle speed to 1200 RPM (± 75 RPM) with the low idle speed screw.
- Low idle fuel: turn the low idle fuel needle in slowly until engine speed decreases, then back out approximately 3/4 to 1 turn.
- Recheck idle speed with a 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
- Preliminary 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.