KEITH BLACK 10.6:1 PISTON SET, .030 VTWIN 11-2273

Keith Black piston set is .030 oversize and is for a 3-3/4" bore. Piston set has a compression of 10.6:1 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 .030 oversize for a 3-3/4" bore and has a 10.5:1 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.

Fits Models:
FXST 1999-2006
FLST 1999-2006
FXD 1999-2006
FLT 1999-2006