Aluminum Adjustable Chain Tensioner for Yamaha YFZ450 (2004-2008 all 2009 YFZ450 only) 4 Holes

Specification Fits 2004 to 2008 YFZ450 ALL MODELS and 2009 YFZ450 only. Material: 6061 T6 Aluminum Process: Forged & CNC Machined Surface Treatment: Anodized Roller: Polyurethane + Bearing Features Add multiple spring mounting points to make the tension adjustable. It keeps equal tension on your chain which reduces wear on both the chain and sprockets. Tensioners greatly reduce the likelihood that your chain will derail or break from fast acceleration.    Mounts to both footpeg holes in front of  the footpeg. Stainless fasteners and spring. Includes all fasteners needed including longer footpeg bolts. All ATV's have a guard around the small sprocket to keep the chain away from the case if it derails. This is one more safeguard against that.