Keihin Air Adjust Screw — W1446-231-9900

Keihin W1446-231-9900 is the air adjust screw for PWK28; standard PWK33, PWK35, PWK38 and PWK39; PWK35 and PWK38 Quad Vent / Air Striker; PWK36 Quad Vent; historical PWK41; PJ34, PJ36 and PJ38; and PWM38 carburetors.

It meters air through the pilot or slow circuit to provide fine idle-mixture adjustment. On a PWK-style carburetor, turning the screw out generally leans the mixture and turning it in generally richens it. This listing is for the screw, not the separately listed spring.

The PWK28 and standard PWK33 layouts identify the screw at reference 17. Broad PJ, PWK and PWM family labels do not add another model application, standard PWK36 is not listed, and PWK41 remains historical coverage.

• Manufacturer: Keihin
• MPN: W1446-231-9900
• Function: pilot-circuit air adjustment
• PWK33 diagram reference: 17
• Diagram reference: Standard PWK38 — 17
• Diagram reference — PWK28: 17
• Diagram reference — Standard PWK35: 17
• Diagram reference — PWK39 Standard: 17
• Diagram reference — PWK35/PWK36/PWK38 Quad Vent / Air Striker: 17
• Diagram reference — historical PWK41: 17
• Diagram reference — PJ34/PJ36/PJ38: 17
• Diagram reference — PWM38: 17
• Diagram reference — PWK39 Snowmobile: 30