3-5/8 Piston Set Standard Size - V-Twin 11-1709 - Evolution 1984-1998

Sifton piston set is standard size for a 3-5/8 inch Big Bore. Has a 9.75:1 compression 3-5/8 inch bore with a 4-1/2 inch stroke flywheel.

**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.

Notes:

• Suggested to use with Piston Wrist Pin Lock.

Fitment:

Installation instructions (PDF)