Howdy,
These were a rather highspeed, single ring saw that was originally intended for use in Sweden. They are reasonably easy to work on, but hard to decipher for which parts, since there are several versions. There was even a double ring piston option.
The rubber parts are rather poor in these and did not resist our N. American gas very well. The fuel line to the Carburetor was a special thing that mainly specialized in going away.
The saw was rather sensitive to dirt, but if you took care not to let fines get through the airfilter, it was a rather good little saw. The airfilter that came with it was a mesh type that wasn't worth a darn. There were aftermarket flocked filters available, but you have to replace them often enough as they loose their flocking. Care of the air filter was the key to protecting that single ring, and getting good life on this unit.
Best with .325 chain.
Regards,
Walt Galer