As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons for ATV engines. Engineered, forged and machined 100% in the USA, JE Pistons are designed for each specific engine and racing application to provide the ultimate combination of durability and performance. From motocross to dirt track and everything in between, JE Pistons’ performance is proven with every handful of throttle and wave of the checkered flag. Equip your quad with the best in forged pistons.

• Forged in the USA using 2618 aluminum, yielding high tensile strength needed for high-demand performance applications
• Designed specifically for each engine and use application to provide optimized performance durability
• Proprietary Forged Side Relief (FSR) forging design minimizes friction and power loss with reduced skirt width and saves additional weight with a shorter wrist pin
• Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings
• Made 100% in the USA

Piston Series    
JE Pistons

Cylinder Head    
EX/XR 400 R

Bore Diameter    
88.00 MM

Compression Ratio Actual    
11.00:1

Piston Head Type    
Dome

Piston Volume    
0.00 CC

Piston Material    
2618

Forging Type    
Round

Piston Average Weight    
298 GR

Ring Set Included    
Yes

Top Compression Ring Thickness    
0.0400 IN

Second Compression Ring Thickness    
0.0480 IN

Oil Ring Thickness    
0.111 IN

Wrist Pin Outer Diameter    
0.787 IN

Wrist Pin Length    
2.350 IN

Wrist Pin Wall Thickness    
0.140 IN

Product Type    
Engine Piston Kit

Product Market    
ATV|Off-Road