Yamaha YZ250 YZ250X WR250 Phathead cylinder head kit 1999-2026 Color:Gold 7cc stock compression

7cc stock compression

1999-2022 big bore chambers:

Kawasaki KX85 KX80 Phathead cylinder head kit 1991-2026

KX85 & KX100 up to 2013 (see other cap for 2014+)

3cc (95+ octane)Y13 - 8

Yamaha YZ250 YZ250X WR250 Phathead cylinder head kit 1999-2026 Color:Gold 7cc stock compressionYamaha YZ250 Phathead cylinder head kit 1999 2026 Chamber selection: Y20 22cc Stock compression for the X model Y21 21. 1cc Stock (91+ octane) Y22 20. 1cc (100+ octane) Y23 19. 1cc (105+ octane) YZ295 72mm 91+ octane 23. 8cc YZ296 72mm 100+octane 23cc 72mm chamber Does not fit Athena 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