PROX GASKET KIT TOP END

§ 01 / Part

ProX Top-End Gasket Kit 09345803 for KTM EXC520 SX520 2000-02 SX525 2003-06 EXC 525 RACING 2003-07 SMR525 2004-05 SMR450 2004-07 SX450 2006

Fits 7 bikes
RRP £92.14 Save 20%
£73.71

incl. VAT

In stock — delivered in 6–10 working days

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

Part #: 09345803

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PROX

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§ 02 / About this part

What it is

ProX top-end gasket kit to fit KTM EXC 525 RACING (2003–2007); KTM EXC520 (2000–2002); KTM SMR450 (2004–2007); KTM SMR525 (2004–2005); KTM SX450 (2006); KTM SX520 (2000–2002); KTM SX525 (2003–2006).

A top-end rebuild requires a fresh seal to maintain compression and prevent coolant migration. This kit provides the head gasket, base gasket, and necessary O-rings for your cylinder and head assembly. Use these when replacing your piston or rings to ensure the combustion chamber remains airtight. Always clean the mating surfaces of the cylinder and crankcase thoroughly before installation. Check your workshop manual for the specific torque sequence on the head bolts. These components match OEM specifications for a precise fit on your engine. Proper sealing here is critical for consistent power delivery and cooling efficiency.

§ 03 / Specs

The numbers

Brand
PROX
Part number
09345803
Category
Gaskets & Seals
Weight
0.06 kg
VAT
20%

// Fitment

Will it fit your bike?

Fits 7 models · 7 year-bands

* 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.
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Free UK shipping over £100 ✦ 14-day no-quibble returns ✦ OEM-grade parts only ✦ UK support · Tue–Fri 9–5, Sat 9–4 ✦ Race-shop prices, paddock service ✦ Collection from Leeds by arrangement ✦
Free UK shipping over £100 ✦ 14-day no-quibble returns ✦ OEM-grade parts only ✦ UK support · Tue–Fri 9–5, Sat 9–4 ✦ Race-shop prices, paddock service ✦ Collection from Leeds by arrangement ✦