BLOCKS AND PISTONS CRF250, 450, Suzuki RMZ, DRZ, Yamaha YZ250, 450 and more. Complete block and pistons. Honda, Suzuki, Husqvarna, Yamaha, Kawasaki - Complete block and pistons. Big Bore and High Compression. Honda, Suzuki, KTM, Yamaha, Polaris, Kawasaki... ATV and Motorcycle High-compression piston kits for most bikes in either standard or oversize bore. Or get the entire bolt-on kit: finished block, piston, gaskets, clips and pin. BIG BORE THUMPERS