Kohler — To Adjust Carburetor
Adjustments · Side draft carburetor
From a Kohler service manual covering: KT17, KT17 Series II, KT19 Series II, KT21, Kt19. Check it applies to your exact model before use.
Applies to: Kohler Kt19
Before you start
- Adjusting screw ends taper to critical valve; do not tighten forcefully.
Procedure
- Stop engine; turn main fuel and idle fuel adjusting screws clockwise until they bottom lightly.
- Preliminary: KT17/KT19 turn main fuel screw counterclockwise 2-1/2 turns from bottom.
- Preliminary: KT21 turn main fuel screw counterclockwise 3 turns from bottom.
- Preliminary: all KT models turn idle fuel screw counterclockwise 1 to 1-1/4 turns from bottom.
- Final Main Fuel: run engine at half-throttle 5-10 minutes to warm up.
- Turn main fuel screw clockwise from preliminary setting until speed decreases; note position.
- Turn screw counterclockwise; note position where speed starts to decrease.
- Set screw midway between the two noted positions.
- Final Idle Fuel: allow speed to fall to idle; adjust same as main fuel.
- Idle Speed: run at half-throttle 5-10 minutes; set speed to 1200 RPM (+75 RPM).
Tools required
- Screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Idle speed 1200 RPM (+75 RPM)
Full service-parts list: Kohler Kt19 →
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.