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ProX 36.6118 head and base gasket set for a piston change on the KTM 85 SX and Husqvarna TC 85 from 2018 and the GasGas MC 85 from 2021. The ProX catalogue 2026 lists it up to the 2026 models.
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The ProX 36.6118 is the head and base gasket set for the 85 cc two-stroke engine that KTM, Husqvarna and GasGas share: the seals at the cylinder head and the cylinder base, for a piston change when nothing else on the top end is replaced.
Fits (ProX catalogue 2026): KTM 85 SX 2018 to 2026, Husqvarna TC 85 2018 to 2026 and GasGas MC 85 2021 to 2026, small wheel 17/14 and big wheel 19/16. It does not fit the KTM 85 SX before 2018 or the KTM 105 SX; ProX lists other sets for those.
On this engine the cylinder head seals with O-rings around the combustion chamber insert, not with a flat head gasket, and KTM lists the cylinder base gasket in five thicknesses for setting the squish (KTM spare parts catalogue, 85 SX).
Other sets for this engine: the ProX 35.6118 top end set for a full top end rebuild, the ProX 34.6118 complete set when the bottom end is opened too.
Matching parts in stock: Wiseco 47.00 mm piston kits, Pro-Lite and Racer Elite, and the Wiseco WCA128 crankshaft for the KTM 85 SX.
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Pro-X Racing Parts makes engine and carburettor parts for motocross. Art of Racing stocks the ProX gasket sets for the KTM 85 SX, Husqvarna TC 85 and GasGas MC 85 (complete set 34.6118, top end set 35.6118, head and base set 36.6118), the 52.61018 air filter for the same bikes, and Mikuni VM main and pilot jets in single sizes.
| Make | Model | Years | Notes |
|---|---|---|---|
| Husqvarna | TC85 | 2018–2023 | |
| KTM | 85 SX | 2018–2023 |
