Plus that two-stroke simplicity means low cost maintenance! Motorcycles Motocross 8548 PSN . 2015 Yamaha YZ85 is brand new-cust bought for son not realizing the bikes power-ready to ROLL! the MINI RACER OF CHOICE FOR FUTURE CHAMPS. the YZ85 is ready to race and features a high performance two-stroke engine for instant power and legendary Yamaha durability...