so if i hang my HT upside down from the top tube, and flip the manifold and carb so it's upright, will it run?
It outa, funny lookin' and as uncomfortable as that would be lol - while to my knowledge it's not been done with one of our HTs, theoretically there's no reason for it to be any different than any other two stroke mounted in an inverted position compaired to it's stock intent.
Personally, I've built and flown an ultralight aircraft powered by a Rotax 440 two stroke - a common snowmobile* engine. While designed for upright use, it was necessary to invert it to conform to the airframe, "flipping" the manifolds and carbs ofc. While some detractors claimed that this would lead to a potential fouling problem w/residual fuel & oil trapped in the heads and that sounds logical, even may be true - I never experenced any problems in spite of the fact I used the choke to shut down after a flight. *shrug* Hardly the same engine as our HTs I'll admit - but it's what experience I've had and the theory is the same anyway lol
*snowmobile engine
This may or may not be true, but it was persistent lol - apparently when two stroke ultralights became popular, a few two stroke manufacturers decided to build up & upgrade their engines to offer specifically to the ultralight community (bearings as one example). Rotax apparently chose another route and upgraded
all their 440 and similar engines, regardless of application, resulting in a superior motor even if "just" in a snowmobile.
Jus' thought that a neat bit of trivia lol