Honda CR250 1997-2001 Phathead cylinder head kit Chamber selection:HF23 - 15.5cc (100+ octane) WR200 WR250 WR500 YFB250 Timberwolf

WR200 WR250 WR500 YFB250 Timberwolf 2x4 YFM350FW Big Bear 4x4 YFM350X Warrior YFS200 Blaster YFZ350 Banshee 1991

300SX  - 23

Y32 -  (100+ octane)

K51 - 42cc  Stock compression

Honda CR250 1997-2001 Phathead cylinder head kit Chamber selection:HF23 - 15.5cc (100+ octane) WR200 WR250 WR500 YFB250 TimberwolfHonda CR250 Phathead cylinder head kit 1997 2001 Chamber selection: HF21 17. 4cc Stock compression HF22 16. 4cc (95+ octane) HF23 15. 5cc (100+ octane) HF24 14. 4cc (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