Big bore atv engine change 250CC to 300CC 1)Change normal 69mm ... 300CC,gsmoon parts of atv,300cc engine atv These parts fit for ATV,Quad,Pit bike,Dirt bike,Go Kart,Buggy For ATV and Quad,fit ... :Water cooled VOG/Yamaha/Linhai 250 Cylinder kit for ATV or Go Kart1) Cylinder Middle Height:83mm Total Height:106mm, ... Kit Piston Rings 300cc VOG Linhai Kinroad Buyang Gsmoon ATV Buggy Go Kart Scooter Parts