Kawasaki KX100 Suzuki RM100 Phathead cylinder head kit 1991-2021 Chamber selection:KX40 - 7.4cc Stock compression 2cc (95+ octane)

2cc  (95+ octane)

2cc  Stock compression

9cc stock compression

4cc 110+ octane

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Kawasaki KX100 Suzuki RM100 Phathead cylinder head kit 1991-2021 Chamber selection:KX40 - 7.4cc Stock compression 2cc (95+ octane)Kawasaki 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