3 Plate Kit – Replacement or Upgrade kit for all older Trail Bikes manual clutch 2 plate kits and 3 plate kits purchased prior to 6/30/05 (all Manual Clutch kits purchased after this date came with these plates). If you have an 88cc bore kit or smaller displacement engine, no need to update until your clutch starts to slip. If you have a 108 bore kit, recommend upgrading with this kit as the metal plates are stronger and will hold up longer.