I have one that is on it's fourth airframe. Been back to TT once for a new piston and sleeve (they honored the warranty even though it was confessed up-front crash damage).

Sounds like you have a fuel feed problem. Are you covering the intake and spinning the prop a half-dozen times (no glow starter) to draw fuel up prior to starting?

I did end up putting a Perry carb on mine after I snapped the needle valve housing. Added 600 rpm up top and starts easy.