Engines and Components› Pistons and Piston Rings

JE Pistons

JE Pistons 99-08 Honda TRX 400EX - 85MM/10.5 to 1 Piston Kit

$269.99

SKU: J001 379165

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

This is a top-end rebuild kit including a JE Piston for Honda TRX400EX, TRX400X, and XR400R models. It's a 4-stroke engine rebuild kit with corrosion-resistant, durable, greasable, and sealed features, designed for performance. The kit includes a cylinder barrel, gasket set, piston rings, pistons, and wrist pins.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandJE Pistons
Part NumberJ001 379165

Videos

I Installed The CHEAPEST Big Bore 440cc Kit On My Honda 400ex (For Testing Purposes)

I Installed The CHEAPEST Big Bore 440cc Kit On My Honda 400ex (For Testing Purposes)
QA Parts Cylinder & Piston Kit | Honda TRX 400EX/X

QA Parts Cylinder & Piston Kit | Honda TRX 400EX/X
Honda TRX400EX Top End Rebuild | Part 1: Disassembly

Honda TRX400EX Top End Rebuild | Part 1: Disassembly
Testing AMAZON Chinese Honda 400ex Top End To See How Long it Lasts! (SHOCKING RESULTS!)

Testing AMAZON Chinese Honda 400ex Top End To See How Long it Lasts! (SHOCKING RESULTS!)
Honda 400ex Install CRF TRX 450r Timing Chain, Replace Base Gasket, Head Gasket, Brand New OEM Parts

Honda 400ex Install CRF TRX 450r Timing Chain, Replace Base Gasket, Head Gasket, Brand New OEM Parts
Honda TRX400EX Top End Rebuild | Part 2: Assembly

Honda TRX400EX Top End Rebuild | Part 2: Assembly
400EX: Unboxing BPRATV 465EX Big Bore Kit

400EX: Unboxing BPRATV 465EX Big Bore Kit
400EX Top End Rebuild Part 3: Rebuild & Installation | Partzilla.com

400EX Top End Rebuild Part 3: Rebuild & Installation | Partzilla.com
2007 Honda TRX400EX Top End Replacement Ep60

2007 Honda TRX400EX Top End Replacement Ep60

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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