CYLINDER ONLY 54MM YAMAHA YZ 125 97-04, STD BORE

YAMAHA    
YZ 125    2001-04 Direct replacement
YZ 125    1997-00 Requires below changes 
    
PLEASE NOTE: When installing this cylinder on,

YZ 125 1997-00, must use cylinder head from 2001-04    
YZ 125 1997-98, must use exhaust header from 1999-03
YZ 125 1997-99, must use 2 original power valve springs, from years 2000-23 (OEM# 90508-16134-00)