Honda CR500 1985-2001 Phathead cylinder head kit with compression release Color:Gloss Black Stainless hardware and one way

Stainless hardware and one way valve/breather

SX51-09 (100+ octane)

72mm chamber Does not fit Athena

Athena145 9cc (100+ octane)

K51 - 42cc  Stock compression

Honda CR500 1985-2001 Phathead cylinder head kit with compression release Color:Gloss Black Stainless hardware and one wayHonda CR500 Phathead cylinder head kit with compression release 1985 2001 Kibblewhite compression release included Chamber selection: H50 66. 4cc Stock compression H51 64. 4cc (95+ octane) H52 62. 5cc (100+ octane) H53 60. 8cc (110+ 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