§ 01 / Part
PX4172 PISTON KIT ALUMINUM 66.50MM +0.50MM
incl. VAT
Usually dispatched within 3 working days.
Authorised stockist
PROX
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§ 02 / About this part
What it is
The PROX PISTON KIT ALUMINUM 66.50MM +0.50MM, top end. Stocked by Iron Offroad, the UK MX hard parts specialist.
This assembly restores compression when your cylinder bore shows wear or scoring. It operates within the cylinder, converting combustion into mechanical force. Use this oversize option after a professional rebore to ensure a precise seal. The kit includes the rings, gudgeon pin, and circlips. Always check your ring end gap before installation. Ensure the arrow on the crown points toward the exhaust port. Lubricate the small-end bearing and pin during assembly. This is a standard service item for high-hour engines to prevent skirt failure and maintain peak power delivery.
§ 03 / Specs
The numbers
- Brand
- PROX
- Part number
- PX4172
- Category
- Top End
- Weight
- 0.27 kg
- VAT
- 20%
// Fitment
Will it fit your bike?
Fits 4 models · 4 year-bands
Yamaha 4 models
No matches. Try a different make or model.
* 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
// Related
