Prevent damage to your motorcycles left side motor case bearings, inner primary bearings, clutch hub bearings and transmission output gear bearingsManual chain tensioner allows you to set the chain to the proper 5/8''-7/8'' (cold) freeplay and never have to worry about it being too tight28% finer teeth spacing (compared to '01-'06 chain adjuster) for more accurate adjustmentsActive Plate and Back Support Plate investment cast with 4130 SteelChain shoe machined from Nylon 66Increases torque by 3.42 ft/lbsReduces primary noiseHelp prevent damage to primaryImproves motor bottom end and inner primary race bearing durabilityMade in the U.S.A.