VT#: 11-2216

Keith Black flat piston set is standard size with a compression ratio of 8.6:1, 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 standard size 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.

FXR Super Glide® 1984-1994
FXD Dyna Glide® 1991-1998
FLST Heritage Softail® 1986-1998
FLT Tour Glide® 1984-1998
FXST Softail® 1984-1998

Use the ring end gap instructions to avoid ring butting.