Polaris Sportsman Outlaw 90 Big Bore Kit – 49mm Cylinder Wiseco Piston Top End Rebuild

Want to wake up your 2007-2014 Polaris Sportsman or Outlaw 90?

This big bore kit bumps you up to a 49mm cylinder and piston setup for more grunt on the trails.

It’s a complete top end rebuild kit with components from top brands like Wiseco, Namura, and Vertex—so you’re getting quality alloy steel, aluminum, and stainless parts.

The kit includes gaskets, piston, rings, and cylinder, all engineered to bolt on with minimal fuss.

It’s a direct replacement for multiple OEM part numbers including 0454934 and 40122M04900.

Whether you’re rebuilding a tired engine or looking for a performance edge, this kit delivers.

Made in the USA and backed by a 1-year warranty.

Note: Prop 65 warning applies for California buyers.