ProX Piston Kits are comprehensive coming complete with: Piston / Ring Kit / Wrist Pin / Cir Clips. ProX also offers oversized piston options in order to follow manufaturer Piston to Cylinder Wall clearances. ProX pistons are precision machined on the...

Inspired by our Pro Stock Drag Race engines, these updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance. Bolt-in kits do not require machining, rebalancing or engine removal,...

This bolt-in big bore kit is easy to install, and requires no machining or rebalancing. This is the largest bore (3.937") that can be fit in a stock engine case. Stock engine height is maintained so there are no manifold or frame fitment issues. The S&S...

Vertex Piston 05-21 Yamaha YZ 125 125cc Top End Piston Kit

Vertex Pistons 17-22 250 SX/17-19 250 XC/20-22 250 XC TPI Top End Piston Kit

Boost any 883cc Harley-Davidson Sportster to 1200cc. No machine shop? No problem, no machining is needed. Don't want to rebalance your stock 883cc flywheels? You don't need to since these pistons weigh the same as stock 883 pistons. Cylinder head...

Vertex Piston 2024 KTM 300 EXC 300cc Cast Replica Piston Kit

Vertex Piston 04-11 KTM 105 SX 105cc Top End Piston Kit

Inspired by our Pro Stock Drag Race engines, these updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance. Bolt-in kits do not require machining, rebalancing or engine removal,...

Vertex Piston 09-23 KTM 50 SX 50cc Top End Piston Kit

Vertex Piston 22-24 Beta RR 2T 300 300cc Cast Replica Piston Kit

This bolt-on big bore cylinder and piston kit will increase the displacement of 88" engines to 97". It is as easy as a stock top end rebuild and requires no machining or flywheel rebalancing. For best performance, appropriate camshafts, performance air...