Description

EXT Special 858 ATAC
The Past Returns
The reimagined EXT Special delivers responsive handling, solid power and everything you need for a full day of trail domination. Exclusive to Arctic Cat, the EXT Special is the only 2-stroke snowmobile equipped with electronic power steering. Coupled with C&A Pro XPT skis and 6” Woody’s Dooly runners, this sled was made for going into every corner with confidence and coming out the other side without fatigue.
| 137″/1.25″ |
Ice Ripper XT |
Push Button Electric
(Arctic Cat G8 Gauge) |
AWS |
Quicksilver/Pinnacle Purple |
| Track/Lug |
Track Type |
Starter |
Suspension |
Color |
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Intuitive Handling
Power Steering
As an Arctic Cat exclusive, Electronic Power Steering (EPS) on a 2-stroke snowmobile is a next-level experience. Unmatched control, easier turns, and intuitive handling will upgrade your ride more than you could imagine.

NAVIGATION AT YOUR FINGERTIPS
ARCTIC CAT G8 DIGITAL DISPLAY
The all new Arctic Cat G8 digital display, powered by Garmin, offers seamless integration with your sled. A built in GPS with preloaded trail maps, customizable data fields and phone connectivity are just some of the features that make G8 essential for every ride. Plus, the group ride functionality utilizes satellite or celluar data, dependent on region, to share the ride with up to 15 people.

SMOOTH POWER DELIVERY
ADAPT™ CVT
With its lightweight, narrow design that increases performance and belt life, as well as the industry’s only self-adjusting clutch, the ADAPT™ CVT system provides better throttle response, smoother power delivery and a ride like no other.
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CONFIDENCE-INSPIRING HANDLING
AWS 42 FRONT SUSPENSION WITH PROGRESSIVE RATIO STEERING
The AWS 42 Front Suspension is engineered specifically to compliment the ZR 858. With ratio steering to reduce rider effort, you’ll experience more control.
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NO ROUGH RIDES
SLIDE-ACTION™ REAR SUSPENSION
Rough rides are a thing of the past. With this industry-exclusive design that keeps the front arm engaged while the rear arm compresses, you’ll hardly feel a bump in the trail.
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A NEW BREED OF POWER
ALL NEW 858 ENGINE
The all-new 858 two-stroke engine is designed for seamless integration into the new CATALYST platform. With an 8% increase in displacement, this engine houses an 11% increase in output over the C-TEC2 800 and weighs 4% less. It features an optimized air intake system, a new exhaust valve design for more consistent power and cleaner emissions, and an all-new crankcase for increased stroke and integrated engine mounts.
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VERSATILE SUSPENSION
ATAC® ADJUSTABLE ON-THE-FLY SUSPENSION
The ATAC Adjustable On-the-Fly Suspension immediately adjusts the FOX® ZERO iQS shocks with the push of a button to navigate changing snow conditions. Choose between two rider profiles, three firmness settings and engage lockout mode to ride your way.
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INCREASED DURABILITY
ARCTIC CAT TRAIL BELT DRIVE
The CATALYST platform utilizies Arctic Cat’s belt drive system rather than a chain drive. This allows for enahnced durability and fewer parts in the system. The adjustable center distance allows for multiple ratio options and makes servicing simple.

QUICKLY CONNECT
ATACH LATCHING SYSTEM
Adding accessories to your sled is a snap with this 4-point latching system. You can install and remove accessories in seconds, so no matter where you are, you can customize your sled with ease.
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Peak Performance Unlocked
CATALYST Chassis
The revolutionary CATALYST platform has been built from the ground up to optimize every aspect of your ride, so much so that you’ll feel at one with the sled. With enhanced ergonomics, a lower center of gravity, our exclusive laydown engine design, specially calibrated suspension and more, this changes everything.
ENGINE
|
EXT SPECIAL 858 ATAC |
| Engine Type |
858, 2-Stroke |
| Displacement (cc) |
858cc |
| Cooling |
Liquid |
| Cylinders |
2 |
| Bore x Stroke (mm) |
85 x 75.6 mm |
| Lubrication |
Electronic Injection |
| Ignition |
Digitally Controlled CDI |
| Engine Starter Output |
270 W @ 3000 RPM |
| Fuel Delivery |
Next Gen. C-TEC2 |
| Exhaust |
APV IV w/ Full Stainless Steel Exhaust & EGT Sensors |
| Fuel Capacity |
10.4 gal |
| Oil System Capacity |
3.0 qt. |
| Coolant System Capacity |
5.4 qt. |
| Minimum Octane |
91 |
POWERTRAIN
|
EXT SPECIAL 858 ATAC |
| Drive Clutch |
ADAPT |
| Driven Clutch |
ADAPT |
| Drive System |
AC Trail Belt Drive |
| Brakes |
Stealth Hydraulic Master Cylinder |
| Clutch Calibration |
0-5,000 ft. |
| Gearing |
30/58 |
| Chain Pitch |
Belt |
| Track Drive Sprocket |
9 Tooth, 2.86 Pitch, Involute |
| Reverse |
Push-Button Engine |
SUSPENSION
|
EXT SPECIAL 858 ATAC |
| Front Suspension |
AWS 42 |
| Ski Shocks |
FOX 1.5 ZERO iQS |
| Sway Bar |
Standard |
| Front Travel |
8.2 in |
| Rear Suspension |
SLIDE-ACTION with 3 Wheel Rear Axle Assembly, Coupling Blocks, Torque-Sensing Link Rear Arm & Adjustable Torsion Springs w/ ATAC System |
| Front Track Shock |
FOX 1.5 iQS |
| Rear Track Shock |
FOX 2.0 ZERO iQS |
| Rear Travel |
13.5 in. |
DIMENSIONS
|
EXT SPECIAL 858 ATAC |
| Overall Chassis Length |
126 in |
| Overall Chassis Width |
48-49 in. |
| Overall Chassis Height |
47 in |
| Track Type |
Ice Ripper XT |
| Track Width |
15 in. |
| Track Length |
137 in |
| Lug |
1.25 in |
| Pitch |
2.86 in. |
| Ski Stance |
41.5-42.5 in – Adjustable |
| Ski Type/Width |
C&A Pro XPT |
| Runner Type |
Woody’s Dooly 6″ |
INSTRUMENTATION
|
EXT SPECIAL 858 ATAC |
| Type of Gauge |
Arctic Cat G8 (CAN w/o GRR) |
| Speedometer |
Digital |
| Tachometer |
Digital |
| Odometer |
Digital |
| Fuel |
Digital |
| Oil |
Digital |
| Coolant |
LCD Icon |
| Clock |
Digital |
| Battery Voltage |
Digital |
| Altimeter |
Digital |
| Hours |
Digital |
FEATURES
|
EXT SPECIAL 858 ATAC |
| Color |
Quicksilver/Pinnacle Purple |
| Heat Exchanger |
Front/Long Tunnel |
| Starter |
Push-Button Electric Start |
| Handlebars |
Hooked |
| Lighting |
LED |
| Seating |
Trail |
| Standard Accessories |
12V Outlet, Electronic Power Steering, Sport Front Bumper, Integrated Goggle Holder, ATACH mounting, Hand & Thumb Warmers, Standard Brake Disc, Ratio Steering, Tether Switch, Tunnel Flares, Visor Plug-In |
| Windshield |
11 in Mid Height |
*Vehicle specifications are subject to change.
*Price includes a one year warranty. Price does not include freight or set-up fees and is subject to change.
WARNING: Arctic Cat snowmobiles can be hazardous to operate. For your safety, all riders should read and understand their owner’s manual and safety instructions. Always wear an approved helmet and other safety apparel. Be aware of natural hazards you may encounter and don’t drink and ride. All scenes depicted or described were performed by professional riders under carefully controlled conditions. Never attempt to duplicate these maneuvers or encourage others to do so. Arctic Cat recommends that all operators take a safety training course. For safety and training information, please see your local dealer.