CYLINDER WORKS offers you a 270cc BIG BORE cylinder for your motocross YAMAHA YZ250F, YZF 250cc 4 stroke from 2014 to 2015 and YAMAHA WR250F, WRF 250cc 4 stroke from 2014 to 2017. This aluminum kit has the same characteristics as your original cylinder except that we go from Ø77mm 250cc to Ø80mm 269cc real and all this without any adaptation or modification to do on your engine. You will be able to mount it without problem with your cylinder head and camshaft of origin. This complete top engine is of a very high quality and finish. The coating is made of nickel silicon carbide to guarantee a minimal friction surface and increase the reliability and duration of your cylinder. But it also allows to have more torque and performance than the original engine. Let's talk about the piston, it is made at VERTEX which is one of the largest manufacturer in the world of high-end piston. The head of the piston is worked to allow an excellent engine compression. It is moreover graphited to have a better lubrication during its passage. We recommend this high end engine for those who wish to give their machine more performance without having to make any modifications. This cylinder is of course sold complete. It includes the cylinder, piston, ring, axle, clips and the complete gasket pack. You will not need anything else to reassemble this product. A list of vehicle adaptable for this kit is below. Contractual photo to come.