Solo is independently owned company by the Emmerich family headquartered in Singlfingen, Germany.
Good people.
Built a real neat hang glider engine.
DOLMAR 9010 is private labled for Solo since they really went bust in the USA on big saws above 70 cc years ago.
Unfortunately when they intro'd the 667, 670, 680, 690, then 603, they had some arrogant Americans in power in the USA who didn't know saws, or the market. Would 'hear' but not listen. I remember a few good arguements with them.
Have since taken care of business, and are have become a stable company producing a good line of Euro styled back pack blowers, trimmer-brushcutters, lawn equipment (mowers, tractors, tillers for the European market), and still make some of the best pump sprayers, mist blowers in the world.
Solo's coloring & nomanclature is neat & qiute simple:
All red color meant Pro.
Black & red meant Semi Pro. (Yellow was for Lowe's. etc.).
This was based on power to weight ratio, cylinder type, and some smaller features.
Example model 667.
First # designates product type. 6 = chain saw.
Second two #'s = displacement 67cc.
Black & red coler = Semi Pro.
Orginally there was both a 667 & 670. Only difference was displacement, porting, color & price.
667 was 67cc, open transfer port. Window style port covers.
670 was 70 cc, closed transfer port. Window style covers.
670 had real good power, but was high priced for US market, and eventually was dropped.
Can put 70 cc cylinder assy on 667
680 (80cc), 690 (90cc), 603 (103cc) were basically the same chassis. New 694 (90cc) is now the big saw flagship.
651, 651SP have been around for close to 10 years. Solid design, debugged, reliable, pretty good power, pretty easy to service, and generally a good selling price.
Similar to DOLMAR 111-PS540 models that have been out for almost 20 years. Have a good design, continue to improve upon it, keeps service simple, and costs down vs companies that are bringing out models to replace models every other year.