Athena P400485100017 Standard Bore Cylinder Kit (54mm, 125cc) - Premium 2-Stroke Top End Rebuild Kit with Forged Piston & Gaskets, Compatible with Yamaha YZ125 2005-2021 Tumbler or Supermoto street sections

or Supermoto street sections

offering reliability and style for every ride

high carbon steel (HCS) blades

fully-integrated 5' (by 1-1/4" diameter) hose provides durability

Athena P400485100017 Standard Bore Cylinder Kit (54mm, 125cc) - Premium 2-Stroke Top End Rebuild Kit with Forged Piston & Gaskets, Compatible with Yamaha YZ125 2005-2021 Tumbler or Supermoto street sectionsRESTORE YOUR DIRT BIKE TO PEAK OEM PERFORMANCE Bring back the crisp throttle response, razor sharp power delivery, and high revving factory reliability of your 125cc two stroke engine with the Athena Standard Bore Cylinder Kit (Part No. P400485100017), a premium OEM style replacement package engineered and manufactured in Italy. Entirely cast from high grade aluminum and treated with a specialized Motor Nicksil (Nickel Silicon) coating, this cylinder