Forged.040 10.5:1 Compression Piston Kit - Wiseco K1689 - Evolution Sportster 1988+

Wiseco #: K1689

Wiseco piston set is.040 oversize and has a compression of 10.5:1. Set includes Hasting X rings.

**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:

Installation instructions (PDF)