arobatix -
yes, this is the only EI i have, i will borrow another one from a friend to eliminate (or confirm) EI problems.
also, i will re-open the carb and clean it again, wont hurt.

the engine is mounted on a biplane that i designed and built from scratch.
is is absolutly heart breaking not to fly it because of a rebellious engine [] , i only have a total of four flights with this biplane because of the time spent fiddling with the engine.

(how do i upload a picture?)