Aktiv Grizzly
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 as one of the best dual-track snowmobiles in the world.[citation needed] 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 |