Honda CR250 1997-2001 Phathead cylinder head kit Chamber selection:HF23 - 15.5cc (100+ octane) 152SXefi (100+ octane)

152SXefi (100+ octane)

2cc (105+ octane)

4cc  (95+ octane)

copper washers

Honda CR250 1997-2001 Phathead cylinder head kit Chamber selection:HF23 - 15.5cc (100+ octane) 152SXefi (100+ octane)Honda 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