Athena P400485100038 105cc Big Bore Cylinder Kit with Cylinder Head (53mm Bore) - Premium 2-Stroke Performance Upgrade, Compatible with Yamaha YZ85 2002-2018 Cut Off Tool and RM-Z450 from 2005 to

and RM-Z450 from 2005 to 2017

it’s the perfect upgrade for serious riders who want more power

Whether you're charging through rocky trails

The bit prevents bit wear from hardened screws and extends bit life when fastening screws

Athena P400485100038 105cc Big Bore Cylinder Kit with Cylinder Head (53mm Bore) - Premium 2-Stroke Performance Upgrade, Compatible with Yamaha YZ85 2002-2018 Cut Off Tool and RM-Z450 from 2005 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