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and polishing• Intake port timing• Transfer port timing adjustments and flow optimization• Squish band machining for improved combustion efficiency• Base cut for increased compression
Less fatigue
These components are specifically intended for use with Undaunted Manufacturing exhaust systems and are not designed for use on a stock saw muffler setup
Whether you’re in the shop
Easily tighten and loosen bar nuts
309 Machine HP500i CNC Ported Cylinder Kit model_stihl_661 and polishing• Intake port timing•Wake 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
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