Aftermarket Keihin PWK 40mm Bored Carburetor (38mm PWK Bored to 40mm). Increase airflow and unlock more top-end power with this high-quality aftermarket Keihin-style PWK carburetor, professionally bored from 38mm to 40mm. This carburetor is designed for high-performance two-stroke engines with port work, big bore kits, aftermarket exhaust systems, and other engine modifications that require increased airflow over a standard 38mm carburetor. Each carburetor is pre-jetted with a proven baseline setup to provide an excellent starting point. Every engine combination is different, so final jetting may be required depending on your engine modifications, fuel type, elevation, temperature, and riding conditions. If you need help with tuning, send me a message. I can recommend a jetting setup that will get you close and can also supply additional jets for fine tuning. High-quality aftermarket Keihin PWK carburetor. Professionally bored from 38mm to 40mm. Increased airflow for high-performance and modified engines. Excellent throttle response and fuel atomization. Replaceable main and pilot jets. Compatible with standard PWK jets and replacement parts. Ideal for motocross, dune riding, drag racing, ATV, woods, and off-road applications. Main Jets: 165 & 175. Pilot Jets: 45 & 55. Venturi Diameter: 40mm (Bored from 38mm). Engine Side Mounting Diameter (OD): Approx. Air Filter Side Mounting Diameter (OD): Approx. Intake Bell Inside Diameter: Approx. Accepts Standard PWK Main Jets, Pilot Jets, Needles, and Replacement Parts. This carburetor is commonly used as a performance upgrade on modified. Banshee YFZ350 (High-Performance Builds). Please compare your original carburetor dimensions before purchasing. This carburetor is intended for modified engines and may require custom jetting or minor installation changes depending on your application. 1 × Aftermarket Keihin-Style 40mm Bored PWK Carburetor. Spare Main Jets (165 & 175). Spare Pilot Jets (45 & 55). Please verify all measurements, specifications, and fitment information before purchasing. This carburetor is intended for high-performance and modified applications. Due to the wide variety of engine combinations, installation may require custom jetting, tuning, or minor modifications to achieve optimum performance. Some older motorcycles and ATVs may require heating the original intake boot and/or airbox boot during installation. Rubber hardens with age, making installation more difficult. Warming the boots with a heat gun or hot water will typically restore flexibility for easier installation.
