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

this pair provides the ultimate in advanced knee protection and comfort for serious riders

damage due to debris

Our team is made up of real riders who know what it takes to make a tire that performs when it matters most

making it compatible with various downpipe and exhaust system configurations

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