Upgrade your Yamaha YZ250 with the AC Racing YZ250 Power Valve Block Off Kit. This kit is essential for high-performance YZ engines. Crafted with precision, the 99-UP YZ 250 Power Valve Block Off Kit offers a reliable and straightforward solution to optimize your engine capabilities. Trust AC Racing for quality and innovation to keep you ahead of the competition. Comes with the 3 peices and screwes necessary to install