720451 Economy Kit Includes 42MM Hrs Carburetor and Air Cleaner Ada

The Mikuni HSR42 Smoothbore Carburetor is a performance-focused upgrade designed for Evolution Big Twin and Twin Cam engines. This unit features a 42mm venturi that flows 20% more air than previous models, supporting builds with high-lift cams and big bore kits. The flat throttle slide operates on roller bearings, providing a light, smooth action and an unobstructed venturi at full throttle for precise air-fuel metering. Constructed with a cast body and a high-capacity float bowl, it includes an adjustable accelerator pump for immediate throttle response. This carburetor is designed to work with 1990-2017 style throttle cables, offering a cleaner look by eliminating the need for external overflow tubes through its advanced needle-valve assembly.