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The KTM 85 SX, Husqvarna TC85, and GasGas MC85 run the same 85cc 2-stroke platform from 2018 onwards. Same engine, same airbox, same filter.
The Prox 52.61018 is a direct fit for all three. Two layers of open cell polyurethane foam - the outer layer catches the coarse debris, the inner layer catches what gets through. The thick flat foam sealing ring presses flush against the airbox wall with no gap around the perimeter. A filter that does not seal correctly lets unfiltered air bypass the foam entirely, regardless of how good the foam is.
Fitment:
- KTM 85 SX — 2018-2024
- Husqvarna TC85 — 2018-2024
- GasGas MC85 — 2021-2024
Part number: 52.61018
Brand: Prox Racing Parts
Foam type: Dual-layer open cell polyurethane
Seal: Thick flat foam sealing ring
OEM replacement: Yes - direct fit, no modifications
Oil before use. In dusty conditions replace every 1-2 rides. At a race, check after every moto.
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We ship to every country DHL serves. Orders shipped to EU destinations qualify for free DHL shipping once the cart subtotal reaches €150. Orders shipped outside the EU are charged live DHL rates, calculated automatically at checkout.
You have 30 days from delivery to return any item in original condition. Full policy →
Pro-X Racing Parts is a European specialist in engine rebuild components for motocross and off-road competition. The range covers forged pistons, connecting rods, bearings, seals, gaskets, and complete rebuild kits for 2-stroke and 4-stroke engines across all major makes and model years.
Each Pro-X piston is manufactured to OEM bore dimensions and surface finished for direct bolt-in fitment without machine work. Kits are packaged per-engine application and include all components required to complete a piston replacement or full top-end rebuild. Pro-X covers an extensive model matrix from current production back through older competition bikes.
| Make | Model | Years | Notes |
|---|---|---|---|
| GASGAS | MC 85 | 2021–2024 | |
| Husqvarna | TC85 | 2018–2024 | |
| KTM | 85 SX | 2018–2024 |
