PX4040 PISTON KIT ALUMINUM 89.00MM STANDARD

Name: PROX PISTON KIT ALUMINUM 89.00MM STANDARD
Brand: PROX
SKU: PX4040
Price: 147.98 GBP
Availability: InStock

Fits Honda CR 500 R

RRP £184.97 Save 20%

£147.98

incl. VAT

In stock — ships in 3 working days

Usually dispatched within 3 working days.

Part #: PX4040

Authorised stockist

PROX

14-day returns

Easy & hassle-free

Secure checkout

256-bit encryption

§ 02 / About this part

What it is

The PROX PISTON KIT ALUMINUM 89.00MM STANDARD, top end. Stocked by Iron Offroad, the UK MX hard parts specialist.

This piston kit sits in the cylinder and is the primary moving part of your top-end. It is manufactured to precise tolerances to match your standard 89.00mm bore diameter. Replace this component at the recommended hour interval to avoid fatigue and potential cylinder damage. The kit includes the piston, rings, gudgeon pin, and circlips required for a standard top-end service. Measure your bore carefully to ensure you select the correct size for your current cylinder condition. This kit provides a reliable seal and restores the compression needed for peak engine performance.

§ 03 / Specs

The numbers

Brand: PROX
Part number: PX4040
Category: Top End
Weight: 0.57 kg
VAT: 20%

// Fitment

Will it fit your bike?

Fits 1 model · 1 year-band

Honda CR 500 R 1984–2001

* 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.