09100964 PISTON KIT REPLICA Ø 54.00 B

Name: VERTEX PISTON KIT REPLICA Ø 54.00 B
Brand: VERTEX
SKU: 09100964
Price: 109.17 GBP
Availability: InStock

Fits Yamaha YZ 125

RRP £136.46 Save 20%

£109.17

incl. VAT

In stock — ships in 3 working days

Usually dispatched within 3 working days.

Part #: 09100964

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§ 02 / About this part

What it is

The VERTEX PISTON KIT REPLICA Ø 54.00 B, motocross part. Stocked by Iron Offroad, the UK MX hard parts specialist.

This cast piston serves as a direct alternative to OEM part 4XM-11631-30-D0. It sits in the top-end, engineered to meet factory tolerances for heat expansion and durability. The (B) sizing is designed for cylinders that require a slightly larger piston to maintain optimal clearance. You should replace this kit at the service intervals specified for your bike to prevent compression loss. Before assembly, check the ring end gap and ensure the gudgeon pin is lubricated. This kit includes the piston, rings, pin, and circlips for a complete workshop rebuild.

§ 03 / Specs

The numbers

Brand: VERTEX
Part number: 09100964
Weight: 0.18 kg
OEM cross-refs: 4XM-11631-30-D0
VAT: 20%

// Fitment

Will it fit your bike?

Fits 1 model · 1 year-band

Yamaha YZ 125 1998–2001

* 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.