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All Hirths have Al-Nikasil coated cylinders for superior performance and reliability. Al-Nikasil in simple terms is a nickel based material, applied in a paste form. When super heated it becomes part of the cylinder itself. Al-Nikasil provides for a super low coefficient of friction allowing Hirths not only to produce more hp than our nearest competitor but also to run with greater efficiency and reliability.
Hirths crankshafts are 4130 chrome moly steel. Heads, rings, block casting, connecting rods and associated components are all of the highest grade alloys available today.