Kawasaki KX100 Suzuki RM100 Phathead cylinder head kit 1991-2021 Chamber selection:KX40 - 7.4cc Stock compression FX12 - 7

FX12 -  7

Yamaha YZ85 Phathead cylinder head kit 1993-2018 YZ80

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KTM105 2025 Phathead cylinder head kit GasGas MC105 Husqvarna TC105 supermini

Kawasaki KX100 Suzuki RM100 Phathead cylinder head kit 1991-2021 Chamber selection:KX40 - 7.4cc Stock compression FX12 - 7Kawasaki KX100 Phathead cylinder head kit 1991 2021 Chamber selection: KX40 7. 4cc Stock compression KX41 6. 4cc (95+ octane) KX42 6. 0cc (100+ octane) KX43 5. 6cc (105+ 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