I'm not the expert you might need when it comes to the GY-6 motors.Only worked/owned a few.Your's is a Tong Jian GY6 -150cc based off that engine code.Wonder why your buggy is called a YS200? If you buy jug & piston to match you can put any big bore kit on basically any GY6 -157 that says it fits. Hope that helps- To the best of my knowledge the difference on these motors are the "P" before 57 & no "P" having different head design- Verify the bolt pattern.Ask Tom @ SYC power sports (sponsor) he'd give you all the info on the good ones that work.
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