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7cc (100+ octane)
2cc (100+ octane)
WR250F WR426F YFM250 Bear Tracker YFM350F Wolverine 4x4 YFM350X Warrior YFM400 Big Bear 2x4 YFM400 Big Bear 4x4 YFM400A Kodiak YFM400F Kodiak 4x4 YFM600FW Grizzly 4x4 YFM660R Raptor YFS200 Blaster 2000
4cc (95+ octane)
4cc (105+ octane)
Honda CR500 1985-2001 Phathead cylinder head Chamber selection:HN51 - 64.4cc (95+ octane) 7cc (100+ octane)Honda CR500 Phathead cylinder head kit 1985 2001 This model does not have the compression release Chamber selection: HN50 66. 5cc Stock compression HN51 64. 4cc (95+ octane) HN52 62. 5cc (100+ octane) HN53 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 heads are made