Athena P400485100038 105cc Big Bore Cylinder Kit with Cylinder Head (53mm Bore) - Premium 2-Stroke Performance Upgrade, Compatible with Yamaha YZ85 2002-2018 Lawn Mower MASSFX and 12 MPH—allowing parents to

and 12 MPH—allowing parents to tailor the ride to their child’s skill level

and cornering

including a Kickback Brake and E-Clutch for anti-rotation

More Power

or weathered bodywork

Athena P400485100038 105cc Big Bore Cylinder Kit with Cylinder Head (53mm Bore) - Premium 2-Stroke Performance Upgrade, Compatible with Yamaha YZ85 2002-2018 Lawn Mower MASSFX and 12 MPH—allowing parents toUPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low end torque, and unmatched acceleration from your 85cc youth two stroke racing engine with the Athena Big Bore Cylinder Kit (Part No. P400485100038), a premium race proven package engineered in Italy to seamlessly convert your factory setup into a high revving, high output 105cc powerhouse. Entirely cast from high grade aluminum and treated with a specialized