Len Performance Front Track (Center) Shock, Arctic Cat ZR / Riot / Pantera / Norseman 2012–2025 (54-11000F)
Len Performance Front Track (Center) Shock, Arctic Cat ZR / Riot / Pantera / Norseman 2012–2025 (54-11000F)
Len Performance
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Most orders are ready within 24 hours. Supplier-order exceptions are confirmed by email; freight to A2D is included in the product price. Need same-day pickup? Call 907-306-3062.
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Confirm your machine’s year, model, submodel, and the selected size or option before ordering. Need help? Contact the A2D team.
Product details
Len Performance LS4-11000F rebuildable front track shock, also called the center shock, for the rear suspension on Arctic Cat ZR 5000 through ZR 9000 (129 / 137, including RR and Thundercat), Riot 6000 / 8000 / 9000 146, Pantera 3000 / 6000 / 7000, Norseman 3000 / 6000 / 8000, Bearcat 3000 LT, XF 6000 / 7000 CrossTour and the 2012–2013 M 800 HCR, model years 2012 through 2025. It replaces the factory front track shock with a coil-over reservoir shock. At $616.95 each, it is A2D's value pick for a rebuildable, adjustable reservoir front track shock: clicker adjustment, a reservoir and a serviceable design without the cost of a race-level shock.
The front track shock controls how the skid loads under acceleration, how the sled transfers weight and how much ski pressure you keep when you get on the throttle. Being able to adjust it, rather than living with fixed factory valving, is the single biggest change most riders feel in the rear suspension. 5-click compression adjustment and threaded preload rings let it be set for rider weight and trail conditions.
Fitment. Sold each. Pairs with the Len Performance 54-11000R rear track shock for a complete rear suspension (Len Performance sells the pair as kit LS4-11000K). Matching ski shock: 54-11000. Chassis: Arctic Cat ProCross.
Fitment list (Len Performance year/model lookup)
- Bearcat: 2016-2017 Bearcat 3000 LT
- M-series: 2012-2013 M 800 HCR
- Norseman: 2018 Norseman 3000 154; 2018 Norseman 6000 ES 154; 2019 Norseman 6000 X ES 153; 2021-2024 Norseman 8000 X ES 153
- Pantera: 2015-2019 Pantera 3000; 2015-2019 Pantera 6000; 2015-2019, 2024-2025 Pantera 7000; 2016-2019 Pantera 7000 LTD
- Riot: 2020-2023 Riot 6000; 2020-2024 Riot 8000 146; 2022-2024 Riot 8000 ES 146; 2020-2024 Riot 9000 146; 2020 Riot X 8000
- XF: 2018 XF 6000 Crosstour 146; 2016-2018 XF 7000 Crosstour
- ZR: 2014-2017 ZR 5000; 2014-2023 ZR 6000; 2016-2019, 2024 ZR 7000; 2014-2024 ZR 8000; 2022, 2024 ZR 8000 ES 137; 2016-2017 ZR 9000 129 RR; 2017-2025 ZR 9000 137 RR; 2019 ZR 9000 LTD; 2019-2025 ZR 9000 Thundercat 137
Distributor listings (Dennis Kirk) also show this shock for ZR 6000 El Tigre / R-XC / iACT, ZR 8000 ATAC and Riot 8000 X Alpha One models, 2016–2023. Confirm your model with us if it is not in the list.
Features
- 5-click compression adjustment, tool-free.
- Aluminum reservoir shock: the remote-style reservoir keeps oil temperature down and damping consistent on long pulls.
- Fully rebuildable, serviceable shock. Len Performance rebuild kits and replacement parts are available.
- Hardened chromoly shaft for strength and seal life.
- Forged aluminum eyelet heads with premium steel and NBR bushings.
- Powder-coated spring resists corrosion and holds rate in cold, wet conditions.
- Threaded shock body with anodized dual-ring locking preload adjusters: set sag once and it stays set.
- Sold each.
Specifications
| Part number | 54-11000F (Len Performance LS4-11000F) |
| OEM part number replaced | 2704-966 / 3704-348 (per distributor listings) |
| Shock location | Front track shock / center shock (rear suspension) |
| Chassis / platform | Arctic Cat ProCross |
| Adjustments | Compression (5), plus threaded spring preload |
| Length, extended | 315 mm / 12.4 in |
| Length, compressed | 220 mm / 8.7 in |
| Stroke | 95 mm / 3.7 in |
| Spring | Powder-coated coil spring included, 65.3 mm / 2.6 in diameter |
| Top eyelet | 22.3 mm ID x 22.4 mm wide (0.9 in x 0.9 in) |
| Bottom eyelet | 22.3 mm ID x 18.4 mm wide (0.9 in x 0.7 in) |
| Weight | 4.25 lb (6 lb shipping) |
| Includes | One shock |
| Rebuild kit | 54-00002 (Len LSR-00002), per Dennis Kirk |
| Sold | Each |
Ordering and installation. Sold each. Ships from stock at our Anchorage shop, or from our distributor's Boise, Idaho warehouse when not on the shelf. In-store pickup is available at checkout. Installation and shock setup are available at A2D Motorsports; call (907) 306-3062 to schedule. Len Performance rebuild kits are available, so the shock can be serviced or re-valved rather than replaced.