Mikuni Rs Series Radial Flat Slide Carburetor Rs34D21K

  
Designed for inline four-cylinder performance to offer higher horsepower gains with the world's top motorcycle road race and drag race teams Offer smooth, controllable throttle response with precise fuel-metering demands with high-volume fuel/air required by race engines Flat throttle valve design provides the strongest signal for precise and instantaneous throttle response Accelerator pump spray nozzle shoots fuel directly into the intake tract for immediate engine response Check carb spacing to verify fitments; use spacing chart on how to check spacing Jetting may need to be changed per application, see chart for included jetting Float bowl vent allows atmospheric pressure into float bowl for fuel flow Larger-diameter spigot O. S may require different mounting flanges Include adjustable accelerator pump and adjustable idle screw Adjustable throttle return spring allows spring return pressure Include enrichment starter system for easier cold starting Jet needle has easy adjustment slots for quick tuning Made in Japan.