Part Number: 11-2221

Application: 1984-1994 FXR
1991-1998 FXD
1986-1998 FLST
1984-1998 FLT
1984-1998 FXST


Details:
Keith Black flat top piston set is .040 oversize with an 8.6:1 compression ratio for 1984-up Big Twin Evolution models. 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 .040 over sized for a 3.498 bore and has a 8.5:1 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.

UOM: SET

Country of Origin: MEXICO