All Balls Racing – Swing Arm Bearing Kits, including kits for the 12-18 Kawasaki KVF300 Brute Force, 09-23 Yamaha YFZ450R, 04-08 Arctic Cat 400 DVX and 07-13 Honda TRX420 FE. The swing arm pivot carries every bit of chain pull, landing load and side force the rear end sees, in the dirtiest spot on the machine. When the stock bushings or bearings wear, the rear of the quad steps out under power, chain alignment drifts, the rear brake feels vague and the machine wants to hunt in ruts instead of tracking straight. Each kit supplies the pivot bearings or bushings, thrust washers and dust seals for one specific chassis, so the pivot bolt torques down with the correct preload and no slop. Riders who race or ride sand notice the difference immediately: sharper corner entry, a rear end that stays planted on the throttle, and steady chain tension between adjustments. Doing the swing arm pivot bearing job also protects the pivot bolt and frame ears from wearing oval, which turns routine service into fabrication work later. Give us your year, make and model and we will confirm the correct swing arm bearing kit before you order.