yeah i figured.. anyways i found the idle speed screw and i changed it a lot .. so right now both my high speed and idle speed needles are messed up..
the engine starts only when i apply full throttle and it's really fast and if i reduce the throttle to 1/2 the engine quits.. also there is a lot of white smoke coming out.

PS: I also tried changing the propeller to a broken one that i had before so that it'll make it safer for me to work with the engine. It is ALMOST balanced and really short. Does that make a difference other than the increased vibrating due to it being unbalanced?