84.5Mm 450Cc Engine Upgrade Kit Cylinder Piston For YFM400 400 Kodiak 450 This engine upgrade kit includes a cylinder and piston designed to fit YFM400 and 400 Kodiak 450 models.The kit features a bore size of 84.5 mm and increases engine displacement to 450cc.It is intended for use in performance or engine rebuilds.Components are machined to standard tolerances for proper fitment and function.The piston is compatible with standard connecting rod and crankshaft configurations.This kit replaces the cylinder and piston assembly and supports standard head gasket and exhaust manifold installation.