Athena P400485100077 106cc Big Bore Cylinder Kit with Modular Head & Exhaust Valves (53mm Bore) - Premium 2-Stroke Performance Upgrade, Compatible with Yamaha YZ85 2019-2026 Level Accessories long-life battery built for pros

long-life battery built for pros and serious DIYers alike

it’s the trusted choice for youth motocross and trail riding

while a fine inner layer blocks microscopic dust without restricting airflow

while the revolutionary tire profile boosts straight-line stability and cornering precision

Red and green LED indicators

Athena P400485100077 106cc Big Bore Cylinder Kit with Modular Head & Exhaust Valves (53mm Bore) - Premium 2-Stroke Performance Upgrade, Compatible with Yamaha YZ85 2019-2026 Level Accessories long-life battery built for prosUPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low end torque, and unmatched acceleration from your modern era 85cc youth two stroke racing engine with the Athena Big Bore Cylinder Kit (Part No. P400485100077), a premium race proven package engineered in Italy to seamlessly convert your factory setup into a high revving, high output 106cc powerhouse. Entirely cast from high grade aluminum and treated with a