Kawasaki KX250 2003-2004 Phathead Racing cylinder head kit Chamber selection:K22 - 20.2cc (95+ octane) 6cc (100+ octane)K53 - 38

6cc  (100+ octane)K53 - 38

YFM200 Moto-4 YFM350FW Big Bear 4x4 YFM350X Warrior YFS200 Blaster 1988

6cc (105+ octane)

CX50 stock compression

1cc StockY22 - 20

Kawasaki KX250 2003-2004 Phathead Racing cylinder head kit Chamber selection:K22 - 20.2cc (95+ octane) 6cc (100+ octane)K53 - 38Kawasaki KX250 2003 2004 Phathead Racing cylinder head kit Chamber selection: K21 21. 6cc Stock compressionK22 20. 2cc (95+ octane)K23 19. 4cc (100+ octane)K24 18. 3cc (105+ octane) Phathead Kits include a head shell with one combustion chamber, two sets of o rings, cylinder head nuts, copper washers, some stickers for your bike and tool box and installation instructions.. Phathead cylinder heads are made of 6061 T6 billet aluminum. The material is