• Replica style 3-3/16 bore piston set has a 9:1 compression ratio and is oversize .040. Piston set alloy is cast in a permanent steel mold and includes rings.

• **Note:Run engine at moderate speeds for at least 500 miles avoiding excessive running in lower gears in order to properly break-in new pistons and rings.

   1972-1985 Harley-Davidson XL