the 7th post and we still havent been TOLD what the engine is... at least now we have a pic and know what were dealing with here... next time...MORE INPUT! in-for-mation!
judging by the slack on the cable, the slides not lifting.
take carb off. check that slide is lifting, and that the narrow angled slot cut into the bottom of the slide, is facing the idle screw side of the carb. theres a tiny brass pin that engages the slot that the cable sits in on the other side of the carb... they only go in one way...properly!
then pour a few cc fuel down the intake tube, try starting it then. if it doesnt fire up easily the exhaust is blocked. oven cleaner or a file.
if it fires easily its the carb. pull it apart, and dont be scared, its SIMPLE AS inside. just blow EVERYTHING with compressed air, thoroughly, then put back together... usually just gunk in the main jet. get a fuel filter, clean the tank, use clean fuel...
tip. take your head off, rotate it 90 degrees. check which way the open end of the sparkplug gap faces, and try pointing it towards the exhaust. but have the fines on the head run parallel with the airflow.... not at right angles! tighten nuts in a cross pattern, a little at a time.
check gaskets for leaks.
make sure wires are black to black, blue to blue.
replace that screw thats missing from the clutch cover before the cover breaks!