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Keihin 16173-001-0040 is the float-bowl plug-screw O-ring for PWK28; PWK33; PWK35; PWK35 Quad Vent / Air Striker; PWK36 Quad Vent; PWK38; PWK38 Quad Vent / Air Striker; PWK39; historical PWK41; and PWK39 Snowmobile carburetors.
It is also documented for FCR-MX37, FCR-MX39 and FCR-MX41; CR Special CR26, CR29, CR31, CR33, CR35, CR37 and CR39; PWM38; PJ34, PJ36 and PJ38; and PE20, PE22, PE24, PE26, PE28, PE30, PE34, PE36 and PE38 carburetors.
The O-ring seals the removable plug screw and appears at reference 7 on the PWK28 and standard PWK33 diagrams. Its nominal size is 18.50 mm inside diameter with a 2.85 mm section, but that measurement alone does not establish generic-size interchange or vehicle fitment.
- Keihin MPN: 16173-001-0040
- Application: standard PWK33
- Diagram reference: 7
- Nominal size: 18.50 × 2.85 mm
- Diagram reference — PWK28: 7
