YIKONG YK4107 Parts Portal Axle Gear 11t 21t 21040
If the gears feel tight after installing YIKONG YK4107Pro Portal Axle Gears, the issue is often caused by installation rather than the parts themselves. Check that the gears are installed in the correct positions, the bearings are fully seated, the grease hasn't been applied excessively, and the screws are tightened evenly. If one side is overtightened, it may slightly deform the portal housing and cause the gears to bind. Rechecking and adjusting the installation will usually restore smooth gear operation.