YAMAHA
IMPORTANT INSTALLATION NOTES:
*When installing this cylinder on the models YZ 125 LC 1997-00 you must use cylinder head from 2001-04.
*For 1997-98 models, it is necessary replace the original exhaust muffler with 1999-03 version
*For 1997-99 models it is necessary to use 2 original Yamaha torsion springs (power valve) from years 2000-23 (OEM# 90508-16134-00)