I don't think a single person has bought anything from him.
Engines from my limited 3 years experience of 2 stroke.
Started with a 30.5cc King motor engine, cheap, easy to work on, top end rebuild kit was £22. Killed it.
The bought a 29cc 30Degrees North engine to go in my Baja when I also bought my 30 degrees north truck.
Better than King Motor, bit more expensive for rebuild kits but reliability was multiple times better than the KM and felt like twice the power.
Wanted more power for the truck so rebuilt the 29cc into a 30.5cc, better but still not enough.
Spent £300 on a brand new
Zenoah G320 engine, came complete with carb, air filter, exhaust etc. Fitted that to my 30DNT, massive torque increase and big BHP increase from the other engines.
Now for reference, the KM engines would last about 6 weeks between rebuilds, the 30DN engines, 12months and then rebuilt it for more power.
The ZenG320 is easier to start than the other engines, and everyone runs them or a variant of them, the Losi 5iveT 2.0 comes with the ZenG320 so it's not a bad engine.
If I was buying another engine for my Baja it would be a G320.