This kit will make your TRX400EX into a fire breathing 440cc quad. This kit improves overall horsepower from bottom to top.  Want to run with the LTZ400?

Kit includes:

• Wiseco Piston.


• Rings.


• Clips.


• Pin.


• Gasket Kit.


• Cast Iron Sleeve.  

We offer sleeve installation for $175

Available in 11:1 or 12:5-1 compression pistons.