Harley Davidson Twin

Country of Origin: MEXICO. Keith Black piston set is standard size and is for a 3.875 inch bore. Piston set has a compression of 9.3:1 and includes rings. The Keith Black 390 hypereutectic alloy is cast in a permanent steel mold which makes it possible to build a light weight piston that makes more power and uses less fuel and lasts longer. Pistons are standard size for a 3.875 inch bore and has a 9.3:1 compression ratio. The low heat transfer of the alloy keeps the skirts cool so piston expansion is minimal. The combination of a low heat transfer piston alloy and high compression ring placement increases power and economy. The high ring placement alone reduces detonation and increases the top ring temperature. 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. Use this list below to confirm fitment for your bike as it is most accurate fitment for this product. STD Unit Of Measure: SET Approx. Weight: 2 pounds (lbs). Please do not leave feedback without contacting us first. We back the products we sell.

inch

davidson, fits, harley, inch, piston, standard, twin