129ci Big Bore Kit with Non-Highlighted Fins - Black. Fits Milwaukee-Eight 2017up with 107ci Engine.

Features & Benefits:-

* Upgrades Milwaukee-Eight 107ci to 129ci.

* 4.320" Bore.

* 4.375" Stroke (4-3/8").

* Forged Pistons.

* 11.1 Compression Ratio.

* Wrinkle Black Finish.

* Without Highlighted Fins (Typically FXBB, FLSL & FXFB).

* Bolt-on Kit.

* No Crankcase Machining Required.

* Includes Gaskets & Hardware.

* Includes Cam Cover Badge

Suggested Additional Purchase:

Dual spray piston cooling jet kit # SS310-1203

Tech Tips:-

* Will Not Fit 114ci Models.

* Use Care during assembly to avoid damage to Cylinder Spigots.

* Ring gap & Piston to Cylinder Clearance should be checked.

* Rev Limit should be set at 3500 rpm for Initial Run In Period.

* Re-Calibration of Ignition Timing & Fuel Mixture is required.

Proudly Made in the USA by S&S Cycle !