Wiseco carries jet kits for Keihin and Mikuni carburetors to allow tuning after an exhaust or other type of engine modification. These tuning kits will help improve mid-range throttle response and add additional fuel to wide-open throttle running conditions. These kits are sold with five jets per size giving endless tuning capabilities for your off-road bike or snowmobile. Sold as a kit. Detailed Specifications: Jet range: 40 - 85. Number of jets per size: Five. Jet material: Brass. Fuel needles included: No. Quantity: Each kit contains 95 pilot jets. Note: Designed to fit Keihin FCR MX, PJ, PWK, and PWM carburetors.