ProTaper – ProTaper Throttles & Throttle Tubes, including Twister throttle assemblies, aluminum throttle tubes, Twister cam inserts, and handguard-compatible inserts, brings a race-proven approach to the single control you touch most. The Twister throttle assembly replaces the stock tube and housing with a sealed, low-friction design that spins on a bearing surface rather than dragging in dirt-packed plastic, so the throttle returns cleanly and stays smooth deep into a moto. Interchangeable cam inserts let you change throttle rate, meaning you can make a 450 easier to meter in slick conditions or quicken a 250's response on a tight track, all without touching the carb or ECU. Machined aluminum throttle tubes cover models such as the 07-22 Honda CR150R, Yamaha YZ125-YZ250 and shared Suzuki, Kawasaki and Yamaha applications, with separate 2-stroke and 4-stroke Twister assemblies matched to cable pull. A dedicated Twister handguard insert and a Renthal Twin insert keep hardware working together on bikes running guards. Riders trust ProTaper here because precise, predictable throttle feel translates directly into traction control and less arm pump.