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1cc Stock (91+ octane)
Use the Athena Big Bore Gasket
Y20 - 22cc Stock compression for the X model
We replicated the Athena chamber to offer the best performance for your two stroke big bore kit
Suzuki RM250 Phathead cylinder head kit 2003-2009 Color:Matte black 1cc Stock (91+ octane)Suzuki RM250 Phathead cylinder head kit 2003 2009 Chamber selection: Y21 21. 1cc StockY22 20. 1cc (95+ octane)Y23 19. 1cc (100+ 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 stronger and transfers heat better than cast