Suzuki RM125 Phathead cylinder head kit 1991-2003 cobra 5mm big bore chamber 100+

5mm big bore chamber 100+ octane - for use with big bore piston

SX50  Stock

One of the main benefits of the product is the replaceable combustion chamber which are available in a range of compression options

Athena 295cc 72mm YZ250 YZ250X WR250 Phathead cylinder head kit 1999-2026

IT200 YTM225 Tri-Moto 1983

Suzuki RM125 Phathead cylinder head kit 1991-2003 cobra 5mm big bore chamber 100+Suzuki RM125 Phathead cylinder head kit 1991 2003 Chamber selection: Y11 10. 0cc Stock Y12 9. 3cc (95+ octane) Y13 8. 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