Factory run ?? Right..Tell that to the people who can't get their engines started because the needles are set too lean.Or the ..Or me, who fixed a bunch of US engines that had a porosity under the carb and had no pulse, therefore no fuel to the carb..Or Zenoah, who sent out a bunch of G62 engines with a casting porosity under the carb, right into the pulse hole..No pulse, no run..Or the 3W with casting porosity under the reed cage...
Or the person who got a ZDZ opr RCS with the carb gasket covering the pulse hole...Or the US 41 with no loctite on the prop hub that spun off with the first touch of the starter....Factory run ?? You believe in the tooth fairy ?? I have converted many NIB Zenoah engines, none of which were run prior to shipping..
I would recommend you look on Toni Clark's German website, read about Zenoah engines....
Top 2 stroke technology ?? We can only wish..
Motorcycles,, Jet skiis, and snowmobiles are way over what we have....AND... Dub Jett's glow motors..Try finding a gasser 25,000+ rpm..
Honda had a racing 4 cylinder 4 stroke that turned upwards of 20,000 rpm..