This is from Motoworldracing.com. Just looks like the 2 strokes but you may want to check. DANGER! Yamaha Recalls Throttle Pulley on '96-'01 YZ's It has been determined that a possible condition which relates to safety may exist in 1996-2001 model YZ125 and YZ250 motorcycles and in 1997 WR250 motorcycles. In affected motorcycles, a loose or bent inner wire of the throttle cable might derail off of the rotor (cable pulley) in the throttle housing on the handlebar. If this occurs, the throttle cable could be pinched between the rotor and the housing, causing the throttle to stick. This could result in an accident/crash and personal injury or death. The part number for the new style rotor pulley is 5NY-26273-00-00. Please contact your local dealer for this recall! It is very important that you DO NOT ride your motorcycle (if it is one of the listed models) until the modification is made.