I have run thunder tiger engines for a couple of years and just opened this brand new box after having it kick around for about a year.
Tried running it the first few times and it's not sensitive to the high speed needle adjustment hardly at all.
Did a check of the carb and if I block off the intake and close up the needle valve (lightly against the stop) I get a air leak noise when I work the prop back and forth.
It appears that the fuel is being drawn up from the tank on the compression stroke if I use my finger to choke it, but still falls back when I rotate the prop full turn.
Also has this slight hissing noise like an air leak thru the front bearing, but this is a brand new engine.
anyone had problems with TT quality like this.