2025-2026 Arctic Cat ZR / RIOT / M 858 CATALYST Performance Products & Parts | Speedwerx Inc.
For tech info, dyno tests, and videos, check out the product pages below or click here- Technical Information & Videos
The CATALYST platform transformed the experience of mountain, trail and crossover riders alike in 2024. Now with the 858 engine, you can push the limits even further with bigger power in the industry's easiest to ride package. Compared to Arctic Cat's 794cc engine, the 858 provides 11% more power and torque - and in a package that's 4% lighter. New for 2026, models like the EXT Special and M 858 HCX and HCR continue to build on the lineup of machines that debuted to rave reviews in 2025. You know we can't leave well enough alone though- we will continue the development and expansion of our lineup of performance parts and accessories for these new models with the same quality, durability, and of course the Straight-Up USA Horsepower that has made us known as the Worldwide Leader in Arctic Cat Performance!
No need to call for product updates- just keep an eye on this page and our social media channels for announcements on new products. When they are released and available for purchase, you'll see them here first!
TECH NOTE: Power Valve cables- we have seen a large number of sleds that the power valves are not set properly from the factory or they have moved, this dramatically effects the overall performance of you machine. Using AC tool # 836-00005 you need to confirm these are set right and if you have issues check them again. In our opinion, this is needed on every single 858 out there even in bone stock form. There is also a Technical Advisory regarding the Servomotor Bracket Alignment issued 12/5/25- your dealer may have already contacted you about this done this as part of the pre-delivery inspection, but they can help you with these adjustments if you are not comfortable doing them yourself. You can purchase the Adjustment Tool Kit here- https://speedwerx.com/apv-adjustment-tool-kit-858-c-tec2-models.html
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Speedwerx Trucker Hat // 30th Anniversary - Red/WhiteSpecial Price $20.00 Regular Price $30.00sku:SPXTH-25RDWH30TH -
Speedwerx Flat Bill Hat // 30th Anniversary - Black/BlackSpecial Price $20.00 Regular Price $30.00sku:SPXFB-25BLKBLK30TH -
Speedwerx Flat Bill Hat // 30th Anniversary - Gray/BlackSpecial Price $20.00 Regular Price $30.00sku:SPXFB-25GRYBLK30TH -
Tee // Speedwerx First Edition // Black$20.00sku:SPXTS25-FEBLKGet one of these new tees from Speedwerx and support your favorite brand!
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APV Adjustment Tool Kit // Arctic Cat 858 C-TEC2 Models$19.95sku:836-00005Improperly set exhaust valve adjustments can lead to engine bogging, hesitations, and inconsistent running. These are the OEM Arctic Cat tools dealership technicians use to check and adjust the valves.
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Clutch Weight Bushing // ADAPT Clutch - 2022+ Arctic Cat Snowmobile / Wildcat XX$15.95sku:RWB-ACWThese replacement weight bushings are for our ADAPT clutch weights. Sold each.
New and Improved material as of April 2024!
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Tee // Speedwerx 30th Anniversary // Dark Heather GraySpecial Price $15.00 Regular Price $20.00sku:SPXTS25-30THGet one of these new tees from Speedwerx and support your favorite brand!
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Tee // Speedwerx Rental Car Test Driver // CreamSpecial Price $15.00 Regular Price $20.00sku:SPXTS25-RCTDGet one of these new tees from Speedwerx and support your favorite brand!
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TEAM BOSS / ADAPT Driven Clutch Delrin Washers // 2016+ Arctic Cat Snowmobile / Wildcat XX$10.00sku:930651The secondary spring has to rotate in the spider as the clutch shifts. You can greatly reduce the scrubbing friction of the spring with the Delrin washer kit. Sold in a pack of 3.
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Tee // Speedwerx Retro 44 // Heather GraySpecial Price $10.00 Regular Price $20.00sku:SPXTEE22-GRGet one of these new tees from Speedwerx and support your favorite brand!
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Clutch Weight Thrust Washer // ADAPT Clutch - 2022+ Arctic Cat Snowmobile / Wildcat XX$8.99sku:1646-144-050These thrust washers or shims for the ADAPT primary clutch are .050” (1.27mm) thick, or slightly more than the .043" (1.1mm) washers that come stock. SOLD EACH.
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Drive Belt Removal / Deflection Adjustment Tool // ADAPT, TEAM BOSS, & Tied Secondary$7.95sku:650343A must have for your tool box... Learn More -
Speedwerx Clutch Spring Life Washer - Steel or Nylon // Arctic Cat Snowmobile and Wildcat XX with TEAM and ADAPT Primary Clutches$4.95sku:SPXAPSLWRecommended for all high performance and racing applications, these washers improve effieciency and prolong spring life by reducing the chances of the spring binding in the clutch. Available in Steel or Nylon.
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O-Ring, Head- Outer // ZR / RIOT / M 858 CTEC-2$4.29sku:0930-072O-Ring, Head- Outer // ZR / RIOT / M 858 CTEC-2 - SOLD EACH
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O-Ring, Head- Inner // ZR / XF / M 8000 / 800 / 858 CTEC-2$2.66sku:0930-033O-Ring, Head- Inner // ZR / XF / M 8000 / 800 / 858 CTEC-2 - SOLD EACH
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Speedwerx Decals // Straight-Up USA Horsepower Logo$0.00sku:SPXDWe have decals in a variety of sizes for your Snowmobile, ATV, UTV, Trailer, Race Car, Beer Fridge, or just about anywhere else you want to stick 'em! Learn More -
Clutch Roller Bushing Kit // ADAPT Primary Clutch - 2022+ Arctic Cat Snowmobile / Wildcat XX$77.95sku:ACARBBushings SOLD OUT- pre-order now for projected shipment late Mar.
The Speedwerx Clutch Roller Bushings for the Arctic Cat ADAPT clutch are made from Torlon and are much more durable than the OEM bushing material. For your convenience, we have made a kit that includes the three replacement bushings and tools to assist in the removal and installation.
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