Honda CR500 Phathead compression release Combustion chambers Chamber selection:H52 - 62.5cc (100+ octane) Athena 295cc 72mm YZ250 YZ250X
Description
Athena 295cc 72mm YZ250 YZ250X WR250 Phathead cylinder head kit 1999-2026
YFM250 Moto-4 YFM350FW Big Bear 4x4 YFM350X Warrior YFZ350 Banshee 1990
two sets of o-rings
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Honda CR500 Phathead compression release Combustion chambers Chamber selection:H52 - 62.5cc (100+ octane) Athena 295cc 72mm YZ250 YZ250XChamber selection: H50 66. 4cc Stock compression H51 64. 4cc (95+ octane) H52 62. 5cc (100+ octane) H53 60. 8cc (110+ octane)
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