Len Performance Rear Track Shock, Arctic Cat M-Series / Mountain Cat / XF High Country / Yamaha Viper MTX 2012–2025 (54-11001SR)
Len Performance Rear Track Shock, Arctic Cat M-Series / Mountain Cat / XF High Country / Yamaha Viper MTX 2012–2025 (54-11001SR)
Len Performance
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Product details
Len Performance LS4-11001R rebuildable rear track shock for the rear suspension on Arctic Cat M 800 / M 1100 (2012–2013), M 6000 / 7000 / 8000 / 9000 including Mountain Cat, King Cat and Hardcore (2014–2019, Mountain Cat ES 153 to 2021), XF 6000 / 7000 / 8000 / 9000 High Country, Cross Country and CrossTour 141 (2014–2019), and the Yamaha SR Viper MTX (2015–2017) and Sidewinder MTX LE (2019, 2025). It replaces the factory rear track shock with a coil-over reservoir shock. At $611.95 each, it is A2D's value pick for a rebuildable, adjustable reservoir rear track shock: clicker adjustment, a reservoir and a serviceable design without the cost of a race-level shock.
The rear track shock sets how the skid handles deep-snow re-entries, drops and bottoming with gear on the tunnel. This is a coil-over unit with its own powder-coated spring, 5-click compression and 5-click rebound adjustment, and a threaded body with locking preload rings so the rear can be set for rider weight and snow conditions.
Fitment. Sold each. Pairs with the Len Performance 54-11001SF front 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: 2012-2013 M 1100 153; 2012-2013 M 1100 Turbo 153; 2016 M 6000 141; 2015-2016 M 6000 153; 2016 M 6000 ES 141; 2015-2016 M 6000 ES 153; 2016 M 6000 LTD 153; 2016 M 6000 LTD ES 153; 2018 M 6000 SE 141; 2018 M 6000 SE 153; 2017 M 6000 SE ES 141; 2017 M 6000 SE ES 153; 2015 M 6000 Sno Pro; 2016 M 6000 Sno Pro 141; 2014-2017 M 6000 Sno Pro 153; 2016 M 6000 Sno Pro ES 141; 2016-2017 M 6000 Sno Pro ES 153; 2016 M 7000 LTD 153; 2016 M 7000 LTD 162; 2015-2016 M 7000 Sno Pro; 2016 M 7000 Sno Pro 153; 2015-2016 M 7000 Sno Pro 162; 2012-2013 M 800 153; 2014-2015 M 8000 153; 2015 M 8000 Kincaid LTD 153; 2016 M 8000 LTD; 2016-2017 M 8000 LTD 153; 2016-2017 M 8000 LTD 162; 2016-2017 M 8000 LTD ES 153; 2016-2017 M 8000 LTD ES 162; 2015 M 8000 McClure LTD 153; 2017-2019 M 8000 Mountain Cat 153; 2017 M 8000 Mountain Cat 162; 2017 M 8000 Mountain Cat ES 153; 2017-2019 M 8000 Mountain Cat ES 162; 2016-2018 M 8000 SE 153; 2017-2018 M 8000 SE ES 153; 2016 M 8000 Sno Pro 141; 2014-2017 M 8000 Sno Pro 153; 2014-2017 M 8000 Sno Pro 162; 2016-2017 M 8000 Sno Pro ES 141; 2016-2019 M 8000 Sno Pro ES 153; 2016-2019 M 8000 Sno Pro ES 162; 2014-2016 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 153; 2014 M 9000 HCR 162; 2017-2019 M 9000 King Cat 162; 2014-2016 M 9000 Sno Pro 162; 2014-2016 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; 2015 XF 9000 Crosscountry LTD 141; 2014-2015 XF 9000 Crosstour 141; 2015 XF 9000 High Country LTD 141
- Yamaha: 2018-2019 Sidewinder MTX LE; 2025 Sidewinder MTX LE; 2015-2017 SR Viper MTX 153; 2015-2017 SR Viper MTX LE 162; 2015-2017 SR Viper MTX SE 153; 2015-2017 SR Viper MTX SE 162
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 | 54-11001SR (Len Performance LS4-11001R) |
| OEM part number replaced | 3704-198 (per distributor listings) |
| Shock location | Rear track shock (rear suspension) |
| Chassis / platform | Arctic Cat ProClimb |
| Adjustments | Compression (5) and rebound (5), plus threaded spring preload |
| Length, extended | 410 mm / 16.15 in |
| Length, compressed | 277 mm / 10.91 in |
| Stroke | 133 mm / 5.24 in |
| Spring | Powder-coated coil spring included, 63 mm / 2.49 in diameter |
| Top eyelet | 8 mm ID x 25 mm wide (0.32 in x 0.99 in) |
| Bottom eyelet | 8 mm ID x 25.4 mm wide (0.32 in x 1 in) |
| Weight | 6.15 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.