09100031 PISTON KIT FORGED 94.95MM A

Name: PROX PISTON KIT FORGED 94.95MM A
Brand: PROX
SKU: 09100031
Price: 158.54 GBP
Availability: InStock

Fits 2 bikes

RRP £198.18 Save 20%

£158.54

incl. VAT

In stock — ships in 3 working days

Usually dispatched within 3 working days.

Part #: 09100031

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§ 02 / About this part

What it is

The PROX PISTON KIT FORGED 94.95MM A, motocross part. Stocked by Iron Offroad, the UK MX hard parts specialist.

Forged replacement for the 426 era: YZ 426 F and WR 426 F. 94.95mm A-size, the spec for a cylinder still within factory bore dimensions. Cross-references Yamaha 5JG-11631-00. The 426 hits its piston hard; a worn skirt lets it rock in the bore and takes the plating with it, so refresh on hours rather than on failure. Piston, rings, wrist pin and circlips supplied. Check ring end gap and seat both circlips fully before torquing the head back down.

§ 03 / Specs

The numbers

Brand: PROX
Part number: 09100031
Weight: 0.39 kg
OEM cross-refs: 5JG-11631-00
VAT: 20%

// Fitment

Will it fit your bike?

Fits 2 models · 2 year-bands

* Fitment data is provided as a guide. Verify compatibility against the bike's owner's manual or service handbook before ordering. Iron Offroad accepts no liability for incorrect application. Full terms and conditions apply.

§ 05 / About Iron Offroad

Iron Offroad

Iron Offroad is the off-road sibling of Iron City and Iron Stable — a UK shop for motocross, enduro, and trail-bike hard parts. Every fitment lives on the site, listed against KTM, Husqvarna, GasGas, Yamaha, Honda, Kawasaki, Suzuki, and Beta. Pick your bike on the timing-tower. Our USP is the data: fully enriched fitment so you find the right part for your bike quickly and get it fitted accurately. Brands you'd find on a paddock workbench — pads, sprockets, plastics, fork seals, cables, gaskets, bars, the things that actually wear out. Road-bike kit, scooter parts, and quad gear sit elsewhere; dirt and e-moto only. We operate from our storage facility in Leeds. Iron Offroad is a trading name of Iron Stable Ltd, registered in Mildenhall — Company No. 17061294. The business has a rich motorcycle history across multiple moto brands — the photos show where we came from — and recently pivoted into hard parts and online retail.