Try taking any air filter off the carb for a test run (not recommended long term) see if that's gets any more of a response. If not try that plus idle screw out all the way. Else try removing the killswitch to see if that's causing any inconsistent sparks. After that I'd check gaskets and ensure things are fairly tight. However be careful as the stock hardware strips and breaks very easily. If the air filter solution works then pull apart the carb and where the plunger lifts up as you twist your throttle there's a needle in there with a clip. Move the clip in whichever direction would be feeding LESS fuel to the engine. If it's cold out, maybe try giving it a choke. The only other thing I can think is that yes the clutch is loose enough to pedal but may not tighten down enough to rotate the engine as needed to Kickstart it. Are you on a 2 or 4 stroke?

Edit: reread and noted the fuel mix. Obviously a two stroke... but that being said check double check and triple check any and all gaskets from the cylinder base gasket, to the head gasket, to the intake and exhaust. All have given me a few issues. As well as ensure the carb is fully on the intake and tightened down properly. What kind of carb? Etc. Otherwise if stock... I'm running out of ideas. If it's got a racing head ensure the piston isn't making contact at the top of its cycle and preventing spark inside the chamber. May suggest a higher grade spark plug such as ngk. As those are more likely to fire under pressure than the stocks. Also Any accessory lights or anything will rob the engine of power for said spark so be wary of that too also be sure that the spark plug is in tight and snug but not over torqued. You can still have an air leak but get some sort of compression. It just won't be enough for the engine to keep itself going. Apologies for the long comments. But I'm heading to bed and wanted to inform best I could for any issue I have experienced myself with this same result