Vertex Piston Kit Ø66.40 A 09102542 for Fantic XX250 2022-25 Yamaha YZ250 1999-2024 WR250 2016 YZ250FX 2016-22 YZ250X 2016-24

Name: Vertex Piston Kit Ø66.40 A 09102542 for Fantic XX250 2022-25 Yamaha YZ250 1999-2024 WR250 2016 YZ250FX 2016-22 YZ250X 2016-24
Brand: VERTEX
SKU: 09102542
Price: 120.27 GBP
Availability: InStock

Fits 5 bikes

RRP £150.34 Save 20%

£120.27

incl. VAT

In stock — delivered in 6–10 working days

Dispatched in 2–3 working days · delivered in 6–10.

Part #: 09102542

Authorised stockist

VERTEX

14-day returns

Easy & hassle-free

Secure checkout

256-bit encryption

§ 02 / About this part

What it is

Vertex piston kit Ø66.40 A to fit Fantic XX250 (2022–2025); Yamaha WR250 (2016); Yamaha YZ250 (1999–2024); Yamaha YZ250FX (2016–2022); Yamaha YZ250X (2016–2024).

This A-size kit is the standard replacement for your 2-stroke engine. It cross-references with OEM part 1P8-11631-00-A0 and is designed for cylinders with original factory dimensions. On a 2-stroke, this is a high-wear item that requires regular swaps to maintain primary compression and prevent skirt failure. This kit includes the rings, pin, and circlips. Check the ring end gap in the cylinder before assembly. Ensure the unit is installed with the arrow pointing toward the exhaust port. Use a new small-end bearing during the rebuild for complete reliability.

§ 03 / Specs

The numbers

Brand: VERTEX
Part number: 09102542
Category: Top End
Weight: 0.31 kg
OEM cross-refs: 1P8-11631-00-A0
VAT: 20%

// Fitment

Will it fit your bike?

Fits 5 models · 5 year-bands

Fantic 1 model

XX 250 2022–2025

Yamaha 4 models

* 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.