I haven't had any problems with 2 stroke glow engines mounted past 90 degrees or inverted.
Make sure the fuel supply line at the tank is at the same level or prefferably a bit lower than the
fuel inlet on the carb. I have 6 engines of my own setup inverted ranging in size from .25 - 1.60.
on my first inverted setup a .61 my tank was higher than my carb and the only time I had a problem
was during fillup the carb would drip fuel on the the table, and continue to drip while sitting (3 line tank).
My remedy was to close the high speed needle and count the turns when closing, then after refilling I would
re-open the needle. I did this for about 20 flights and got tired of it so I lowered the fuel tank. problem
fixed.