The Aktiv Grizzly was a dual-track snowmobile made by Aktiv Maskin Östersund AB in Sweden from 1979 to 1991. The Grizzly is still recognized one of the best dual track snowmobiles in the world. The snowmobile's tracks covered almost one square meter, making it well suited for use in deep snow. Similar dual-track snowmobiles include Bombardiers Ski-Doo Alpine, Ski-Doo Alpine 2 and Ockelbo 8000. Currently two dual-track snowmobile are in production, one in Russia under the name "Buran" and one in Italy, "Alpina Sherpa".
Aktiv started making tracked vehicles 1957 with the Snow Trac, a small personal snowcat roughly the size of a compact car. The company started making small snowmobiles in 1973 after purchasing the Snö-Tric brand. The first dual-track snowmobiles that Aktiv made were the Snö-Tric Blå 75- and SC 20/2 75-.
The Grizzly was also sold under license by Polaris Industries as the "Polaris Grizzly de luxe". This version had a Fuji 440 ccm engine. Also the Finnish company Winha sold early models of Grizzlies produced in 1982 and 1983 under their own brand name. Winha Grizzlies had either a traditional or flexible joint-bogie chassis, and either an Artic Spirit AB 50, A3 or Fuji EC 44-2PM-3000 engine.
Specifications
The Grizzly snowmobile was equipped with dual 38 x 384 cm tracks and a single front ski. Dual front skis were available for the XP model. The engine was a 497 ccm Rotax 503 Scandinavia, which produced 38 HP (28 kW) at the snowmobile's maximum RPM of 5700. In the mid 80's, the Grizzly switched from the traditional wheel-based chassis to a flexible joint-bogie, which made the ride smoother and the passability much better. The carburetor was a VM 32, supplied by Mikuni. De luxe models of earlier Grizzlies had a transmission with one forward and one reverse gear. The last model produced (XP, 1989–1991) had two forward speeds.
| Overall length | 309 cm |
| Overall width | 97 cm |
| Overall height | 141 cm |
| Overall weight | 375/345 kg |
| Motor make | Rotax |
| Motor type | 503 Scandinavia (Alpine) |
| Number of cylinders | 2 |
| Displacement | 497 ccm |
| Bore | 72 mm |
| Stroke | 62 mm |
| HP(kW) @ 5700 RPM | 38(28) |
| Max. RPM | 5700 |
| Fuel lubrication | 2 Stroke Oil 50:1 (2%) |
| Cooling System | Axial Fan |
| Idle RPM | 2100 |
| Ignition/Generator | CDI 12V/140W |
| Spark Plug | NGK B7ES, B8ES or similar |
| Spark gap | 0,5 mm |
| Carburettor | 1x Mikuni VM 32 |
| Fuel | Unleaded Petrol, 90 Oc. or better |
| Engine Variator | Polaris/AKTIV |
| Secondary Variator | Polaris/AKTIV |
| Gear Exchange | 3,0:1 - 1:1 |
| Transmission (De Luxe) | FWD 3,07:1 / REV 4,82:1 |