The Pro Circuit R-304 Silencer is a compact, performance-focused exhaust component designed for select KTM, Husqvarna, and GasGas 85cc motocross motorcycles. Part number 1161985 is engineered to deliver strong performance gains while maintaining the lightweight, compact design expected for closed-course racing applications. This silencer is intended for closed-course use only and is not designed for public-road operation.
The R-304 uses hex-head screws to secure the inlet cap, making removal quick and straightforward when the silencer requires repacking or service. This service-friendly design helps reduce maintenance time between races and supports efficient exhaust system upkeep. The silencer must be used with the applicable Pro Circuit pipe or the specified stock pipe configuration for proper fitment and performance.
Fitment includes the 2018–2021 KTM 85 SX in 17/14 configuration, the 2018–2021 Husqvarna TC 85 in 17/14 configuration, and the 2021–2022 GasGas MC 85 in 19/16 configuration. Verify the motorcycle model, wheel configuration, and exhaust pipe setup before installation. The Pro Circuit brand and manufacturer part number 1161985 provide reliable identification when ordering replacement or competition exhaust components.
Features:
- Compact R-304 design provides strong performance gains for closed-course racing.
- Designed for closed-course racing use only.
- Hex-head screws secure the inlet cap for quick removal.
- Service-friendly construction simplifies silencer repacking.
- Must be used with the applicable Pro Circuit pipe.
- Compatible with the specified stock pipe configuration.
- Fits select 2018–2021 KTM 85 SX and Husqvarna TC 85 models, plus 2021–2022 GasGas MC 85 models.
- Brand: Pro Circuit.
- Manufacturer part number: 1161985.
- Vendor part number: 1161985.
Fitment:
2018 Husqvarna TC 85 (17/14)
2018 KTM 85 SX (17/14)
2019 Husqvarna TC 85 (17/14)
2019 Husqvarna TC 85 (19/16)
2019 KTM 85 SX (17/14)
2020 Husqvarna TC 85 (17/14)
2020 Husqvarna TC 85 (19/16)
2020 KTM 85 SX (17/14)
2021 Gas-Gas Mc 65
2021 Gas-Gas MC 85 19/16
2021 Husqvarna TC 85 (17/14)
2021 Husqvarna TC 85 (19/16)
2021 KTM 85 SX (17/14)
2022 Gas-Gas Mc 65
2022 Gas-Gas MC 85 19/16
2022 Husqvarna TC 85 (17/14)
2022 Husqvarna TC 85 (19/16)
2022 KTM 85 SX (17/14)
2023 Gas-Gas Mc 65
2023 Gas-Gas MC 85 17/14
2023 Gas-Gas MC 85 19/16
2023 Husqvarna TC 85 (17/14)
2023 Husqvarna TC 85 (19/16)
2023 KTM 85 SX (17/14)
2024 Gas-Gas MC 85 17/14
2024 Gas-Gas MC 85 19/16
2024 Husqvarna TC 85 (17/14)
2024 Husqvarna TC 85 (19/16)
2024 KTM 85 SX (17/14)