09103134 PISTON KIT PRO HC TOP END Ø 66.40 B

Name: VERTEX PISTON KIT PRO HC TOP END Ø 66.40 B
Brand: VERTEX
SKU: 09103134
Price: 145.95 GBP
Availability: InStock

Fits 3 bikes

RRP £182.44 Save 20%

£145.95

incl. VAT

In stock — ships in 3 working days

Usually dispatched within 3 working days.

Part #: 09103134

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§ 02 / About this part

What it is

The VERTEX PISTON KIT PRO HC TOP END Ø 66.40 B, motocross part. Stocked by Iron Offroad, the UK MX hard parts specialist.

This high-compression component sits at the heart of your top-end rebuild. It replaces the factory unit to increase cylinder pressure and sharpen throttle response. This B-size kit accounts for minor cylinder wear on a seasoned bore. It cross-references with OEM part 1P8-11631-00-A0. Always check your cylinder diameter with a micrometer before fitting to ensure the correct clearance. Regular replacement prevents catastrophic failure and maintains peak power during race season. Ensure you clean the power valve assembly while the head is off to ensure smooth operation across the rev range.

§ 03 / Specs

The numbers

Brand: VERTEX
Part number: 09103134
Weight: 0.57 kg
OEM cross-refs: 1P8-11631-00-A0
VAT: 20%

// Fitment

Will it fit your bike?

Fits 3 models · 4 year-bands

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.