V-Twin - 11-2217 - 80 inch Evolution Flat Piston Set .005

V-Twin - 11-2217 - 80 inch Evolution Flat Piston Set .005

Description

Keith Black flat top piston set is .005 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 .005 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 teperature. **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:

• FXST 1984-1998
• FLT 1984-1998
• FXD 1991-1998
• FXR 1984-1994
• FLST 1986-1998

Additional Information