FITS ALL 1999 AND NEWER YAMAHA YZ250 TWO STROKE MODELS. 72mm ported big bore cylinder. Wiseco or Wossner 72mm forged piston. Cylinder Works cylinder head machined for 72mm big bore. Big bore power valve assembly matched to cylinder. Maxlock cylinder to crankcase stud kit. Piston uses pump or race gas. At bpratv our kits come with parts from the best brands in the industry. What makes our kits different is they are always more complete than our competitors'. We want you to spend as little time having to search for parts as possible. We always stock the exact same parts from different companies so that when back orders occur we…