Keihin 016.170 PWM 38mm Carburetor The next step in the two-stroke racing carburetor evolution - the PWM38 The exclusive features built into the new Keihin PWM38 results in improved top-end power, throttle response, and overall two-stroke engine performance Shorter overall length for better top end power New throttle slide design for improved main nozzle signal Easy access to both the main and slow jets through the bowl plug screw while a single control for both idle speed and enrichner settings simplifies adjustments