Processing customization is the use of hand-pull start damper switch Size 53 (mm) Model 1166-844-2100 Applicable models FCR28 31 33 35 37 39 40 41mm Item No. SCL-2022110025 Specification damper Product name: Motorcycle carburetor hand-pull cold start damper switch FCR-MX33 35 Throttle Valve 1166-844-2100 English Title: FCR-MX General – Flat-CR Off-Road Racing Carburetor Package Size 5*8*2mm Package Material: Bag Application: Fast shipping and good operation Total new and high quality Part number: 1166-844-2100 / 021-737 Fit for:all Keihi FCR MX carburetors (FCR-MX Flat Slide Carburetor 28mm 31mm 35mm 37mm 39mm 41mm) Please check the part number and compare with pictures provided here before purchasing to ensure proper fitment. Package included: 1??Cold Starter Valve