Yamaha Athena YZ125 144cc 58mm Big Bore Cylinder Phathead version 1998-2000 and 2001-2021 Compression:100+ octane *sample image

*sample image

KTM 125SX TC125 MC125 HUSQVARNA GASGAS Phathead 125 combustion chamber

KTM300SX 2023+ Phathead cylinder head kit

Keep a few in your toolbox and a friend in need will thank you

6cc (100+ octane)

Yamaha Athena YZ125 144cc 58mm Big Bore Cylinder Phathead version 1998-2000 and 2001-2021 Compression:100+ octane *sample imageWe replicated the Athena chamber to offer the best performance for your two stroke big bore kit. Athena YZ125 58mm 144cc big bore compatible. Use the Athena Big Bore Gasket. Phathead Kits include a head shell with one combustion chamber, 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