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Yamaha YZ250 WR250 Phathead cylinder head kit 1988-1998
CX52 (105+ octane)
KTM 65SX 2009 - 2025 Husqvarna TC65 2024 - 2025 / GasGas MC65 2024 -2025 Phathead cylinder head kit
5cc (95+ octane)
2cc StockH02 7
Honda CR85 Phathead combustion chamber Chamber selection:52mm big bore Yamaha YZ250 WR250 Phathead cylinderH01 8. 2cc StockH02 7. 6cc 95+ octaneH03 7. 1cc 100+ octaneH04 6. 4cc 105+ octane 52mm big bore chamber Wiseco 766M05200 and LukesRacing 105cc compatible(requires head gasket) $100