HARLEY 883cc to 1200cc Conversion Piston Set Standard 3.498 inch Fits 1986-UP XL,

Sifton cast piston kit includes reverse domed pistons and Hasting rings. Piston set has a 9.5:1 compression. Piston to cylinder wall clearance is .0015 minimum to .0022 maximum with .002 preferred. No head work is necessary on this Big Bore kit. **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: Requires cylinder boring. 2009-up 883 cylinder cannot be overbored. 2009-up applications will require the use of 1200cc cylinders. FITS HARLEY: 1986-UP XL,