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8cc 100+ octane
4cc 110+ octane
We replicated the Athena chamber to offer the best performance for your two stroke big bore kit
Kibblewhite compression release included
Flex on the competition with our signature geometric designs carved out of solid 6061-T6 billet aluminum
Yamaha YZ65 2018-2025+ Phathead cylinder head kit Color:Raw 8cc 100+ octaneYamaha YZ65 2018 2025+ Phathead cylinder head kit Chamber selection: YZ65 5. 2cc stock YZ66 5. 0cc 95+ octane YZ67 4. 8cc 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
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