KEITH BLACK PISTONS +.040in. Pistons with 8.5:1 Compression Ratio. Fits Big Twin 1941-1979 with 1200cc Engine.

Description

Features & Benefits:-

* Bore = 3.477in.

* Stroke = 3.969in.

* Hypereutectic Alloy is a cast 16% silicon content material.

* Perfect for air cooled engines.

* Low thermal expansion rate = tighter piston-to-cylinder clearance.

* Complete kit includes: two pistons, rings, wrist pins and clips.

* Replaces OEM # 22146-55C

* Replaces OEM # 22146-74A

Tech Tips:-

* Follow Ring End Gap & Piston to Cylinder Clearances as per the supplied