CP Pistons M8 117 10.75:1

Starting with a bore size of 4.125 inches and a stroke of 4.375 inches, these CP Pistons are built for the M8 117 engine platform. They are designed to achieve a 10.75:1 compression ratio, which is a notable increase over stock, offering improved performance for riders looking to get more out of their Harley-Davidson motorcycle.

These pistons are constructed from well-built aluminum, a common material for performance pistons due to its strength-to-weight ratio. The dome volume is -1.3 cubic inches, and the dome height is 1.143 inches, contributing to the overall compression ratio. This set is a solid option for those rebuilding or upgrading their M8 117 engine, aiming for a noticeable boost in power and responsiveness. They are designed to fit a range of Harley-Davidson models, including the Road King, Street Glide, and Fat Boy.

When installing these pistons, it's important to follow the manufacturer's recommended procedures to ensure proper fitment and performance. This piston set is intended for engine builds where increased compression is desired, so ensure your other engine components can support the higher compression and resulting power output.