Len Performance Rear Track Shock, Ski-Doo MXZ 129 2015–2022 & Renegade Sport 137 (54-80001R)
Len Performance Rear Track Shock, Ski-Doo MXZ 129 2015–2022 & Renegade Sport 137 (54-80001R)
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 LS4-80001R rebuildable rear track shock for the rear suspension on the 2015–2022 Ski-Doo MXZ 129 (Sport, TNT, Blizzard, X, X-RS, Iron Dog; 600 H.O. / 600R / 800R / 850 E-TEC, 900 ACE, 1200 4-TEC) and the Renegade Sport 137 (600 Carb 2015–2019, 600 ACE 2017–2020 and 2024–2027, 900 ACE / 1200 4-TEC 2017). It replaces the factory rear track shock with a reservoir shock that has 5-click compression adjustment. At $392.95 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 rMotion skid handles big hits, G-outs and bottoming with a passenger or gear on the tunnel. This is a springless unit that works with the factory rear torsion springs, so it drops in without changing the rest of the skid.
Fitment. Sold each. Pairs with the Len Performance 54-80001F front track shock on the MXZ 129 for a complete rear suspension (Len Performance kit LS4-80001K: one LS4-80001F and one LS4-80001R). Matching ski shocks: 54-80001-1LH / RH. On the 2024–2027 Renegade Sport 600 ACE 137 this is the only Len Performance shock listed. Platform: Ski-Doo REV-XS (2015–2016; 900 ACE / 1200 4-TEC through 2018) and REV Gen4.
Fitment list (Len Performance year/model lookup)
- MXZ: 2016 MXZ 600HO E-TEC Blizzard; 2015-2018 MXZ 600HO E-TEC Iron Dog; 2017 MXZ 600HO E-TEC X; 2016 MXZ 600HO E-TEC X-RS; 2020 MXZ 600R E-TEC; 2019-2020 MXZ 600R E-TEC Iron Dog; 2019-2020 MXZ 600R E-TEC X-RS; 2016 MXZ 800R E-TEC Blizzard; 2015 MXZ 800R E-TEC Iron Dog; 2016-2018 MXZ Blizzard 1200 4-TEC 129; 2016-2018 MXZ Blizzard 600 H.O. E-TEC 129; 2019 MXZ Blizzard 600R E-TEC 129; 2016-2017 MXZ Blizzard 800R E-TEC 129; 2018-2019 MXZ Blizzard 850 E-TEC 129; 2016-2018 MXZ Blizzard 900 ACE 129; 2015-2017 MXZ Sport 600 ACE; 2015-2017 MXZ Sport 600 Carb; 2015-2018 MXZ TNT 1200 4-TEC 129; 2015-2018 MXZ TNT 600 H.O. E-TEC 129; 2019-2020 MXZ TNT 600R E-TEC 129; 2015-2017 MXZ TNT 800R E-TEC; 2018-2020 MXZ TNT 850 E-TEC 129; 2015-2018 MXZ TNT 900 ACE 129; 2015-2018 MXZ X 1200 4-TEC 129; 2015-2018 MXZ X 600 H.O. E-TEC 129; 2018-2022 MXZ X 600R E-TEC 129; 2018 MXZ X 600R E-TEC Iron Dog; 2015-2017 MXZ X 800R E-TEC 129; 2017-2022 MXZ X 850 E-TEC 129; 2015-2016 MXZ X-RS 600 H.O. E-TEC 129; 2019-2020 MXZ X-RS 600R E-TEC 129; 2015-2017 MXZ X-RS 800R E-TEC 129; 2018-2020 MXZ X-RS 850 E-TEC 129; 2017-2018 MXZ X-RS Iron Dog 600 H.O. E-TEC 129
- Renegade: 2017 Renegade Sport 1200 4-TEC 137; 2017-2020, 2024-2027 Renegade Sport 600 ACE 137; 2015-2019 Renegade Sport 600 Carb 137; 2017 Renegade Sport 900 ACE 137
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.
- Sold each.
Specifications
| Part number | 54-80001R (Len Performance LS4-80001R) |
| OEM part number replaced | 503194625 (per distributor listings) |
| Shock location | Rear track shock (rear suspension) |
| Chassis / platform | Ski-Doo REV-XS / REV Gen4 |
| Adjustments | Compression (5) |
| Length, extended | 426 mm / 16.8 in |
| Length, compressed | 277 mm / 10.9 in |
| Stroke | 149 mm / 5.9 in |
| Spring | None (uses the factory torsion springs) |
| Top eyelet | 8.1 mm ID x 19.7 mm wide (0.3 in x 0.8 in) |
| Bottom eyelet | 8 mm ID x 19.7 mm wide (0.3 in x 0.8 in) |
| Weight | 3.70 lb (8 lb shipping) |
| Includes | One shock; the Dennis Kirk listing also shows a mounting bracket, 8 mm x 50 mm hex bolt, flat washer and P-clamp |
| Rebuild kit | 54-00003 (Len LSR-00003), 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.