Sale

Engines and Components› Pistons and Piston Rings

CP Pistons

CP Pistons 17-22 Harley Milwaukee Eight 131 ci, 4.310in Bore, 4.500in Stroke, 11.0:1 CR, 1.080in CH

$650.00 $617.50 Save $32.50

SKU: C00A M5120

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The CP Carrillo High Performance SE 131" (4.310" bore) Replacement Pistons are manufactured from 2618 forged and heat-treated alloy, featuring forced pin oiling, advanced cam and barrel skirt profiles, and precise tolerances. They are designed for Harley Davidson Milwaukee-8 SE 131" Screamin Eagle Crate Engines and 131" Screamin Eagle Big Bore Kits. The M5120 offers a -9.6cc flat top with 11.25 compression with OEM style 89cc heads (10.8:1 with SE Extreme CNC heads).

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandCP Pistons
Part NumberC00A M5120

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy