1200cc Piston set.030 Oversize - Keith Black KB264.030 - Evolution Sportster 1988-2003
Keith Black #: KB264.030
Keith black flat top piston set is.030 oversize with a 9.0:1 compression ratio 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 3.528 inch bore and has a 9:1 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.
Fitment:
| 1988-2003 | XL |