309 Machine HP500i CNC Ported Cylinder Kit model_stihl_661 delivering increased torque and horsepower

delivering increased torque and horsepower along with improved throttle response and cutting performance

Less fatigue

and 585 XP

where it disperses and redirects the exhaust flow before it reaches the screen

Easily tighten and loosen bar nuts

309 Machine HP500i CNC Ported Cylinder Kit model_stihl_661 delivering increased torque and horsepowerWake up your saw with precision CNC porting from 309 Machine. Our focus is simple: maximize power while maintaining the reliability and durability professionals expect. The HP500i Cylinder Kit represents the ideal balance of high performance and longevity, delivering increased torque and horsepower along with improved throttle response and cutting performance. Whats Included Brand new OEM Stihl Cylinder Kit Stihl Part Number 1147 020 1200 OEM cylinder