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| Qty | Part Number | Description |
|---|---|---|
| 1 | B140601 | Base Gasket |
| 1 | B140802 | Base Gasket |
| 1 | B140801 | Base Gasket |
| 1 | B140803 | Base Gasket |
| 1 | CG102.00 | Cometic O-Ring Installation |
| 1 | PV15701 | Power Valve Gasket |
| 1 | PV15801 | Power Valve Gasket |
| 1 | R114V | 114 Viton O-Ring Brown |
| 1 | R23X2.5V | 23mm x 2.5mm Viton O-Ring |
| 2 | R38X3V | 38mm x 3mm Viton O-Ring |
| 1 | R54X2V | 54mm x 2mm Viton O-Ring |
| 2 | R80X2S | 80mm x 2mm Silicone O-Ring |
| 1 | R8X2V | 8mm x 2mm Viton O-Ring |
| 8 | WA133 | 6mm x 10mm Copper Washer |
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The W6994 is a complete O-ring and gasket kit for the KTM 85 SX and Husqvarna TC 85 from 2018 to 2025. These two bikes share the same engine platform and the same sealing requirements.
The kit covers the entire top end. Four base gaskets in the kit address the different sealing surfaces on the cylinder base. Two power valve gaskets cover both power valve covers. The O-ring selection covers every sealing point in the top end: Viton O-rings for high-temperature surfaces and silicone O-rings where flexibility is the priority. Eight copper washers included for the hardware that requires a crush seal.
Viton O-rings hold up to heat and fuel contact better than standard rubber. That matters on a 2-stroke running at the temperatures the 85 SX produces under race conditions.
Kit contents: 4 base gaskets, Cometic O-ring installation guide, 2 power valve gaskets, 114 Viton O-ring, 23mm x 2.5mm Viton O-ring, 38mm x 3mm Viton O-ring x2, 54mm x 2mm Viton O-ring, 80mm x 2mm silicone O-ring x2, 8mm x 2mm Viton O-ring, 6mm x 10mm copper washers x8.
Fitment: KTM 85 SX 2018-2025, Husqvarna TC 85 2018-2025
Part number: W6994
Brand: Wiseco
Made in USA
We ship worldwide every day via DHL. Delivery within the EU is typically 2–3 business days.
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 →
Wiseco is an American manufacturer of forged performance pistons established in 1941. Wiseco pistons are built from high-strength aluminium forgings with proprietary ring groove geometry and coating technologies developed for power sports and motorsport applications.
The motocross piston range covers 2-stroke and 4-stroke applications across all major makes, with available bore sizes in standard and over-bore increments for rebuild and displacement upgrades. Wiseco publishes detailed fitment data by make, model, and year for precise kit selection. Forged construction provides higher tensile strength than cast alternatives and withstands repeated heat cycling without dimensional change.
| Make | Model | Years | Notes |
|---|---|---|---|
| Husqvarna | TC85 | 2018–2025 | |
| KTM | 85 SX | 2018–2025 |
