I highly doubt any .21 engine even carries a true horse power...so all those number ratings, "2.5hp, 1.0hp" is a marketing gimmick.

You have to expect something to go wrong dealing with any of these engines, regardless which manufacturer it is. They dont run these engines from the factory, so there is no "tests" being done on your product once purchased

I have had motors from the manufacturer go bad, and i know for certain it wasnt my fault, but it was never an OS engine.

I did last year crack the crankcase on my EB modded Vspec (8 gallons old or so) i purposly bashed the car around the track, got aggrovated and over shot a jump, bam...case closed.

ever since then i havent had an instance with any of my Vspec motors...they run great, have excellent fuel mileage, and tune very very easily. The only other motor that i know of that was easier to tune, was my old Novarossi P5X.