YZ250 YZ 250 BIG BORE Cylinder 72mm Cylinder Head Power Valve Wiseco Top End Kit. Unlock the hidden power of your YZ250 with this complete 72mm big bore top end kit – the easy bolt-on solution for transforming your bike into a high-performance racing machine. Big Bore Cylinder, Big Bore Cylinder Head, Big Bore Power Valve, Piston, Gaskets, Spark Plug. 72mm bore Wiseco forged piston increases displacement for more power (Includes Rings, Wristpin, & Circlips). Cometic top-end gasket kit ensures a leak-free seal. Big bore cylinder head flows more air/fuel for maximum power gains. Big bore cylinder head – Required for 72mm big bore kit. Big bore power valve kit – Required for 72mm big bore kit. NGK Spark Plug to make sure it fires right up! This bolt-on big bore kit is perfect for motocross racers and performance enthusiasts who want to unlock their YZ250’s full potential. The significant increase in power will allow you to blast out of corners, clear jumps with ease, and motor past competitors on straightaways. Plus, the kit requires no case modifications, so installation is a breeze. Whether you’re a casual trail rider or an aspiring pro racer, this complete 72mm top end kit will take your YZ250’s performance to the next level. BPRATV – The Best Parts. DO YOU NEED TO HAVE THIS ITEM INSTALLED ON YOUR VEHICLE? WE HAVE YOU COVERED! We are BPRATV, offering you the best in parts and service for over 20 years. PRICES AND LISTINGS ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE. Interchangeable part: We stock the same parts from different manufacturers so that when back orders occur, we have a part that is equal in quality and cost to send, preventing what can sometimes be long waits. This would be the only reason your order might vary slightly from the description, and the part that is subbed will always be comparable quality. If you only want a specific brand, just ask and we will let you know if it is out of stock and for how long. Once a part has been installed or prepped for installation it is no longer eligible for return. Over 99% of people in the world are not qualified to build an engine, and it is the responsibility of the person assembling and tuning the engine to make sure all the parts are correct and work properly. We ALWAYS STRONGLY recommend work be done by a qualified, experienced mechanic. Please work with us and we will ALWAYS work with you. No other parts nor any labor are included. We are BPRATV, and we offer a huge selection of Titanium fasteners. Once an item has been used or prepped for use with lubricants, sealant, etc. It is not eligible for return.