Len Performance Front Track (Center) Shock, Arctic Cat M-Series / XF High Country / Yamaha Viper MTX 2014–2025 (54-11001SF)
Len Performance Front Track (Center) Shock, Arctic Cat M-Series / XF High Country / Yamaha Viper MTX 2014–2025 (54-11001SF)
Len Performance
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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 LS4-11001F rebuildable front track shock, also called the center shock, for the rear suspension on Arctic Cat M 6000 / 7000 / 8000 / 9000 mountain sleds (141 / 153 / 162), XF 6000 / 7000 / 8000 / 9000 High Country, Cross Country and CrossTour 141 / 153, and the Yamaha SR Viper MTX / STX / XTX and Sidewinder MTX LE, model years 2014 through 2025. It replaces the factory front track shock with a coil-over reservoir shock. At $497.95 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 front of the track carries weight on sidehills and how much ski pressure you keep when you get on the throttle. This shock has 5-click compression and 5-click rebound adjustment plus threaded preload rings, so it can be set for rider weight and snow conditions instead of running fixed factory valving.
Fitment. Sold each. Pairs with the Len Performance 54-11001SR rear track shock for a complete rear suspension (Len Performance kit LS4-11001K; confirm kit contents with us, as Len's kit page currently lists the ZR kit's parts). Matching ski shock: 54-11001S. Chassis: Arctic Cat ProClimb (M-series and XF High Country) and the Yamaha Viper / Sidewinder MTX built on it.
Fitment list (Len Performance year/model lookup)
- M-series: 2015 M 6000 153; 2015 M 6000 ES 153; 2015 M 6000 Sno Pro; 2014-2015 M 6000 Sno Pro 153; 2015 M 7000 Sno Pro; 2015 M 7000 Sno Pro 162; 2014-2015 M 8000 153; 2015 M 8000 Kincaid LTD 153; 2015 M 8000 McClure LTD 153; 2014-2015 M 8000 Sno Pro 153; 2014-2015 M 8000 Sno Pro 162; 2014-2015 M 8000 Sno Pro LTD 153; 2014-2015 M 8000 Sno Pro LTD 162; 2014-2015 M 8000 Sno Pro LTD ES 153; 2014-2015 M 8000 Sno Pro LTD ES 162; 2014 M 9000 HCR 162; 2014-2015 M 9000 Sno Pro 162; 2014-2015 M 9000 Sno Pro LTD 162
- XF: 2014-2015 XF 6000 Crosscountry 141; 2015 XF 6000 Crosstour 141; 2016-2017 XF 6000 High Country 141; 2015 XF 6000 High Country 141 Sno Pro; 2018-2019 XF 6000 High Country ES 141; 2015 XF 7000 Crosscountry 141; 2015 XF 7000 Crosstour 141; 2016 XF 7000 High Country 141; 2015 XF 7000 High Country 141 Sno Pro; 2014-2015 XF 8000 Crosscountry LTD 141; 2015 XF 8000 Crosscountry Sno Pro 141; 2014-2015 XF 8000 Crosstour 141; 2015-2019 XF 8000 High Country 141 Sno Pro; 2015 XF 8000 High Country LTD 141; 2016-2019 XF 8000 High Country LTD ES 141; 2018-2019 XF 8000 High Country LTD ES 153; 2015 XF 9000 Crosscountry LTD 141; 2014-2015 XF 9000 Crosstour 141; 2015 XF 9000 High Country LTD 141; 2018-2019 XF 9000 High Country LTD 153
- Yamaha: 2018-2019 Sidewinder MTX LE; 2025 Sidewinder MTX LE; 2015 SR Viper MTX 153; 2015 SR Viper MTX LE 162; 2015 SR Viper MTX SE 153; 2015 SR Viper MTX SE 162; 2015 SR Viper STX DX 141; 2015 SR Viper XTX LE 141; 2015 SR Viper XTX SE 141
Distributor listings (Dennis Kirk, Lionparts) also show this shock for the 2016–2019 M 6000 / 7000 / 8000 (SE, Sno Pro, Limited, Mountain Cat, Hardcore), 2017–2019 M 9000 King Cat and the 2017 Yamaha SR Viper MTX. Confirm your model with us if it is not in the list.
Features
- 5-click compression adjustment, tool-free.
- 5-click rebound adjustment.
- 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 | 54-11001SF (Len Performance LS4-11001F) |
| OEM part number replaced | 2704-786 (per distributor listings) |
| Shock location | Front track shock / center shock (rear suspension) |
| Chassis / platform | Arctic Cat ProClimb |
| Adjustments | Compression (5) and rebound (5), plus threaded spring preload |
| Length, extended | 285 mm / 11.23 in |
| Length, compressed | 212 mm / 8.35 in |
| Stroke | 73 mm / 2.87 in |
| Spring | Powder-coated coil spring included, 63 mm / 2.49 in diameter |
| Top eyelet | 8 mm ID x 24 mm wide (0.32 in x 0.95 in) |
| Bottom eyelet | 22.43 mm ID x 15.5 mm wide (0.89 in x 0.62 in) |
| Weight | 4.30 lb |
| Includes | One shock |
| Rebuild kit | Len Performance rebuild kits available; call to confirm the kit number for this shock |
| 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.