2021-2025 Yamaha Mountain Max 800 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 wait is over! Yamaha returns to the two-stroke mountain market in a big way with the Mountain Max 800, which is virtually identical to it's Arctic Cat M 8000 Alpha One cousin so the products we make and sell for the Cats are a direct fit for the Yamaha as well. The C-TEC2 794cc engine with Semi-Direct Injection (SDI) delivers increased performance and rideability in the 160-hp class. It provides crisp throttle response, outstanding mid-range and class-leading performance in addition to improved fuel mileage and reduced oil consumption.
You know we can't leave well enough alone though- we've developed many performance parts and accessories for the 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! We had many machines equipped with our Stage 2 Exterminator Kits out on the snow in the 2017-2018 season, and riders were raving about how they took the smooth running, yet hard pulling 8000 C-TEC2 to another level, with a fun factor above and beyond any other stock displacement, naturally aspirated machine whether it be a ZR trail blaster or a M-Series mountain masher. Those riding M 8000's equipped with our Supercharger Kit reported rock solid pull and go reliability, with power, consistency, and instant throttle response that simply can't be matched by other boosted machines. For 2019, Arctic Cat has made only minor tweaks to the drivetrain on the 8000 series machines, so you can expect the same great performance with our kits and components. The big news is in the suspension department with the ZR iACT models with electronically adjustable shocks, and the new Alpha One model that is truly a game changer in the steep and deep- just add a healthy dose of Straight-Up USA Horsepower to either of these platforms to make the best even better! The 2020-2021 models have changes to the top end and injection system, but the power output is virtually the same as 2018-2019 and our Exterminator Kits and Supercharger will give you the extra kick that will put a permanent grin on your face!
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Stage 2 Exterminator Kit // 2022-2024 M 8000 / RIOT X 8000 / Yamaha Mountain Max 800$2,348.59sku:ACM8000EXT-22-2Our Stage 2 Exterminator Kits are the ultimate bolt-on performance package for the 800 C-TEC2! +12-13hp peak and +16-17hp midrange on 2020-2024 models!
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Stage 2 Exterminator Kit // 2020-2021 M 8000 / RIOT X 8000 / Yamaha Mountain Max 800$2,318.59sku:ACM8000EXT-20-2Our Stage 2 Exterminator Kits are the ultimate bolt-on performance package for the 800 C-TEC2! +12-13hp peak and +16-17hp midrange on 2020-2021 models!
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Stage 1 Exterminator Kit // 2022-2024 M 8000 / Riot X 8000 / Yamaha Mountain Max 800$1,974.74sku:ACM8000EXT-22-1Our Stage 1 Exterminator Kits are a great entry level performance package that easily allows you to upgrade to the Stage 2 down the road! +13hp peak on 2020-2024 models!
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Stage 1 Exterminator Kit // 2020-2021 M 8000 / Riot X 8000 / Yamaha Mountain Max 800$1,944.74sku:ACM8000EXT-20-1Our Stage 1 Exterminator Kits are a great entry level performance package that easily allows you to upgrade to the Stage 2 down the road! +13hp peak on 2020-2021 models!
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Speedwerx ProCharger Supercharger Kit With Intercooler // 2022-2024 Arctic Cat M 8000 / Yamaha Mountain Max 800$1,111.11sku:ACSC-800-22This kit is no longer available, but some parts remain to service existing kits- please have the part numbers and quantities ready and call to order.
This Speedwerx ProCharger Supercharger kit comes as a complete bolt-on kit with everything you need to be ready to ride- there are no addtional expenses required to upgrade the fuel system, clutching, or add an intercooler in order to get a premium quality setup!
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Speedwerx ProCharger Supercharger Kit With Intercooler // 2020-2021 Arctic Cat M 8000 / Yamaha Mountain Max 800$1,111.11sku:ACSC-800-20This kit is no longer available, but some parts remain to service existing kits- please have the part numbers and quantities ready and call to order.
This Speedwerx ProCharger Supercharger kit comes as a complete bolt-on kit with everything you need to be ready to ride- there are no addtional expenses required to upgrade the fuel system, clutching, or add an intercooler in order to get a premium quality setup!
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Fat Daddy Adjustable Single Pipe and Y-Pipe // 2018-2024 ZR / RIOT / XF / M 8000 / 800 C-TEC2 / Yamaha Mountain Max 800$925.95sku:AC800S-ADJ-4-CCOur Fat Daddy Adjustable Pipe Kit comes with interchangeable stinger inserts which allow you to easily tune your pipe for different elevations.
9.8hp gain as tested at DynoTech Research!
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Fat Daddy Single Pipe and Y-Pipe // 2018-2024 ZR / RIOT / XF / M 8000 / 800 C-TEC2 / Yamaha Mountain Max 800 // 5,000 Ft. + Only!$759.95sku:AC800S-15-CCOur Fat Daddy Single Pipe Kits are a must-have for maximum power and performance, and they're lighter than stock too!
9.8hp gain as tested at DynoTech Research!
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Fat Daddy Single Pipe and Y-Pipe // 2018-2024 ZR / RIOT / XF / M 8000 / 800 C-TEC2 / Yamaha Mountain Max 800 // 0-5,000 Ft.$759.95sku:AC800S-14-CCOur Fat Daddy Single Pipe Kits are a must-have for maximum power and performance, and they're lighter than stock too!
9.8hp gain as tested at DynoTech Research!
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Hypershift Clutch Kit // 2022-2024 M 8000 Alpha One / Yamaha Mountain Max 800 - Stock Pipe$549.95sku:CKA800-28Developed and tested by the same team of people that Factory Team Arctic Cat trusts and uses! If you're looking for the best clutch kit for your sled, look no further...
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Hypershift Clutch Kit // 2022-2024 M 8000 Alpha One / Yamaha Mountain Max 800 - w/ Stage 2 Kit$549.95sku:CKA800-28-2Developed and tested by the same team of people that Factory Team Arctic Cat trusts and uses! If you're looking for the best clutch kit for your sled, look no further...
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EZ LYNK Auto Agent 3 Diagnostic Scan Tool and Cables$549.00sku:100EE00AA3Get Connected with The World's Most Powerful Vehicle Scan Tool. EZ LYNK puts your technician in the front seat whenever and wherever you choose and is the vehicle interface for all EZ LYNK apps.
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Hypershift Clutch Kit // 2020-2021 M 8000 Alpha One / Yamaha Mountain Max 800 - Stock Pipe$519.95sku:CKA800-22Developed and tested by the same team of people that Factory Team Arctic Cat trusts and uses! If you're looking for the best clutch kit for your sled, look no further... Learn More -
Hypershift Clutch Kit // 2020-2021 M 8000 Alpha One / Yamaha Mountain Max 800 - w/ Stage 2 Kit$519.95sku:CKA800-22-2Developed and tested by the same team of people that Factory Team Arctic Cat trusts and uses! If you're looking for the best clutch kit for your sled, look no further...
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Power Commander 6 Fuel Controller // Arctic Cat 2018-2024 8000 / 800 C-TEC2 / Yamaha Mountain Max 800 Models$513.32sku:PC6-11027The Power Commander is a fuel injection adjustment unit that plugs inline with the machines stock ECU (electronic control unit). The Power Commander uses original equipment style connectors, so no splicing or cutting of the harness is required. Learn More -
Speedwerx ECU Tunes // Arctic Cat ZR / RIOT / XF / M 8000 - 800 C-TEC2 / Yamaha Mountain Max 800$449.95sku:ECU-8000New 2021 Updated Stock Programming Now Available! Our ECU programs offer the most control to all of the hidden features in the stock ECU and allows us to produce the most power with the best throttle response and acceleration.
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Dynojet AutoTune - Single Channel // For Power Commander V (PCV)$409.98sku:AT-200The AutoTune kit comes with a wideband O2 sensor and controller that connects to the Power Commander V. With this kit, the Power Commander V automatically adjusts the fuel map while riding.
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Lightweight Muffler // Ceramic Coated // 2018-2024 ZR / RIOT / XF / M 8000 / 800 C-TEC2 / Yamaha Mountain Max 800$399.95sku:AC800M-13Our Lightweight Muffler cuts 9.4 pounds from the 800 C-TEC2 while maintaining a very trail-friendly sound level!
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Stealth Head Mod // 2018-2024 ZR / RIOT / XF / M 8000 / 800 C-TEC2 / Yamaha Mountain Max 800$129.95sku:ACFHM-818Our Stealth Head Mod with billet dome inserts is the key to unlock maximum power and performance from the 800 C-TEC2!
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Dynojet Power Commander POD-300 Digital Display // Use With PCV / AutoTune / WideBand 2 / CMD$342.21sku:POD-300The POD-300 is an accessory display for Dynojet devices that support DJ-CAN; including the popular Power Commander V, AutoTune, WideBand 2, and CMD.
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High Flow Y-Pipe - Ceramic Coated // 2018-2024 ZR / RIOT / XF / M 8000 / 800 C-TEC2 / Yamaha Mountain Max 800$249.95sku:AC800Y-6Dyno Testing with about a dozen different Y-Pipe designs has shown little or no gains with the stock pipe, but you can use this as a replacement for the stock one if needed.
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Chain - Borg Warner Hyvo - 13 Wide / 15 Wide$207.95sku:2602-XXXGenuine Arctic Cat OEM Borg Warner Hyvo Chains
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Spider Removal Tool // Arctic Cat ADAPT Primary Clutch$199.95sku:APCSTThis tool is used for spider removal and reinstallation on the ADAPT primary clutches used on 2022 and newer Arctic Cat Snowmobiles and Wildcat XX models.
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Speedwerx Hypershift TEAM Medium Tip Machined Weights // Set of 3$197.70sku:TEAM1TWEIGHTSWeights are designed for the TEAM primary clutches that come on the 2016-2021 Arctic Cat snowmobiles. All of our machined weights come heat treated and black oxide coated to prevent wear and corrosion. We offer 4 different profiles.
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