HARLEY 80 inch Evolution Piston Kit Standard Fits 1984-1994 FXR, 1991-1998 FXD, 1986-1998 FLST,

Replacement 80 inch Evolution moly coated piston kit. Pistons are standard sized. The moly coating helps reduce friction and wear. This kit includes wrist pins Hasting ring set locks and has a 11:1 compression. With a 3.498 inch bore. Features 3.4985 inch bore. **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. *NOTE: Install pistons with raised bars or on wrist pin area towards the sprocket shaft side of the engine. FITS HARLEY: 1984-1994 FXR, 1991-1998 FXD, 1986-1998 FLST, 1984-1998 FLT, 1984-1998 FXST,