Actually, Webra engines ARE different than other two-stroke engines. That's why they cost so much here in the USA.

Yes, you can put a large prop on it and tune accordingly, but you might as well have bought two or three el cheapo engines instead of the Webra, because the Webra is timed and ported to produce its best horsepower while revving up.

A Fun Fly/3D prop isn't really loading down the Webra all that much. Loading it down to me is swinging an 11x7 to an 11x8 prop. Yet, I know there are those that do exactly that. They pay their money and it is their right to waste a perfectly good engine.

When people post questions, I assume that they know how to adjust the mixture screws, so I gloss over that and look at other mechanical possibilities. If someone is so stupid that they complain about how an engine runs before tuning the problem away...