The M chassis, introduced in 2005, gained instant accolades for its lightweight maneuverability and benchmark power-to-weight ratios. For 2007, there are two new engines to improve the power-to-weight even more: the new 800 and 1000 EFI twins, and the 600 EFI II engine carries over from last year.
There are track length options and package options depending on the engine size selected. The M6 comes with either a 141- or 153-inch track. M8s come with a 162-inch option, and there is also a Sno Pro version with suspension updates that replaces the “Limited” branding of previous years. The monster-bore 1000 engine has a 153- or 162-inch track option, both available in Sno Pro trim as well.
All M-Series models have an updated ACT drive system with a push-button reverse system.
Rider-forward ergonomics equip the machines for positive input while boondocking. Sleds feature wide, hooked handlebars with a grab strap for off-trail maneuverability.

Front Suspension: AWS VI; Shocks/Travel: Fox FLOAT/9.2 inches; Rear Suspension: FasTrack Long Travel; Shocks/Travel: Fox Zero Pro/17 to 19 inches; Features: The M8 and M1000 Sno Pro models have Fox FLOAT air-adjustable shocks on the front suspension and titanium rear suspension springs in the FasTrack Long Travel skid. Both upgrades are used to reduce weight.

All 2007 M-Series models have a Camoplast Challenger track with a lug height of 2.25 inches regardless of engine choice or track length. Track lengths and availability is as follows:
141 inches: M6 EFI, M8 EFI
153 inches: M6 EFI, M8 EFI, M8 EFI Sno Pro, M1000 EFI, M1000 EFI Sno Pro
162 inches: M8 EFI, M1000 EFI, M1000 EFI Sno Pro
800 EFI Laydown:
The popular M7s are no more, replaced with M8s that host a new 794cc twin that makes 145 hp. Arctic Cat claims the engine has 26 percent more torque and uses 11 percent less fuel than the 700 engine it replaces. The new eight uses a twin spark plug-head to increase the spark energy for a more efficient burn at low- and mid-rpm ranges. The engine also has Arctic Power Valves, 3D ignition, 46mm throttle bodies and an engine knock sensor to prevent detonation.

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