Yamaha YZ85 YZ80 Phathead cylinder head kit 1993-2018 Color:Gold We have teamed up with

We have teamed up with HP Race Development to fine tune the GET ecu platform

CR500 models 1999 and older

KTM85 2004-2012 Phathead Racing Cylinder head kit

S21 -  20

5cc Stock compression

Yamaha YZ85 YZ80 Phathead cylinder head kit 1993-2018 Color:Gold We have teamed up withYamaha YZ85 Phathead cylinder head kit 1993 2018 YZ80 Chamber selection: Y01 6. 4cc StockY02 6. 0cc (95+ octane)Y03 5. 6cc (100+ octane)Y04 5. 2cc (105+ octane) 52. 5mm big bore chamber 100+ octane for use with big bore piston 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