Provided is a cylinder liner having a first portion with a first thermal conductivity and a second portion with a second thermal conductivity. The first portion having the first thermal conductivity can include as-cast projections or a coating of a material, as desired. The first thermal conductivity can be greater than the second thermal conductivity. In this manner, the cylinder liner can exhibit a thermal conductivity gradient.

A cylinder for a V-twin engine including a body with a first end having a surface configured to mate with a cylinder head, and a second end configured to mate with a crankcase. A sleeve is fixedly secured within the body to define a cylinder bore. The sleeve includes a first portion that extends from the first end of the body to the second end of the body. The first portion of the sleeve has a first wall thickness. The sleeve further includes a second portion that extends out of the second end of the body to be received within a crankcase bore. The second portion has a second wall thickness that is thinner than the first wall thickness. The sleeve is constructed from a chromoly steel alloy material, and the second wall thickness is less than 0.060 inch.

The invention provides for a cylinder bore coating system that includes at least one cylinder bore configured to receive an axially movable piston. The at least one cylinder bore has a recessed area having an axial length and a radial depth. A first coating layer is arranged within at least the recessed area. A second coating layer covers the first coating layer and a portion of the at least one cylinder bore axially spaced from the recessed area.

The invention provides for a cylinder bore coating system that includes at least one cylinder bore configured to receive an axially movable piston. The at least one cylinder bore has a recessed area having an axial length and a radial depth. A first coating layer is arranged within at least the recessed area. A second coating layer covers the first coating layer and a portion of the at least one cylinder bore axially spaced from the recessed area.