VEHICLE COMPATIBILITY: for Yamaha 660R 2001 2002 2003 2004 2005, please check car make, model, year and OE number before purchase.
PRODUCT INFORMATION: Adopting chromoly steel with durability and strict tolerances for a well alignment. 13 tooth bolt washer with CNC precision machined to stay durable and not easily deformed.
OE Number 90179-18020 90215-21256
NOTIFICATION: The Lock washer has splines inside just like shaft, just line those splines up, and hold it's outer edge so to keep it engaging the splines then put the nut on. Use a 50 foot pounds wrench to tighten the nuts. Last fold over lock washer to keep firm.
PACKAGE LIST: 1x Front Sprocket Holder Lock Nut, 1x Bolt Washer. Please check relevant video to get professional replace methods when install flywheel and stator.