309 Machine M10 Decompression Valve Plug type_cylinder_porting and polishing• Intake port timing•

and polishing• Intake port timing• Transfer port timing adjustments and flow optimization• Squish band machining for improved combustion efficiency• Base cut for increased compression

we recommend pairing this setup with a performance exhaust

What’s Included:

we recommend sizing up• Expect slight shrinkage after first wash like most 100% cotton garments

The socket

309 Machine M10 Decompression Valve Plug type_cylinder_porting and polishing• Intake port timing•Upgrade or replace your factory decompression valve with this high quality Performance By 309 M10 Decompression Valve Plug. Designed for reliability and durability, this plug eliminates common failure points found in OEM decompression systems. Precision machined from 6061 aluminum and finished with a sleek black anodized coating, its built to perform while adding a clean look to your engine. Features: Fits most STIHL and Husqvarna models (M10 thread)