Yamaha YZ65 2018-2025+ Phathead cylinder head kit Color:Gold 9cc (100+ octane)

9cc (100+ octane)

5cc (95+ octane)

0cc 95+ octane

103cc 52/53mm big bore chamber 100+ octane - for use with big bore piston

Yamaha YZ65 2018-2025+ Phathead cylinder head kit Color:Gold 9cc (100+ octane)Yamaha 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