So i have a 2017 coolster qg50 and i recently just got a problem fixed when ever i would start it the backtire would engage with the engine and if i started it it would go crazy so i recently got the whole situation where when i pull or roll the bike it wont engage my engine anymore and i was so happy and if course another problem happens when i start the bike thank god i had the chain off it revs up so high i thought the bike was going to space lol and there was gas all around the carb and it gave me the nastiest backfire ever sounded like a gun so i restrict a little gas and turn choke off and it idles for 2 seconds and cut off i try to start it again then boom what its been doing full max pinned standing on the gas and it scares the crap out of me not gonna lie scared to start a little 49cc 2stroke now lol i took the carb and its still clean i had cleaned it literally 2 weeks ago and never rode it yet so im soaking the jet and carb bowl and float in seafoam been sitting for abt 1 day and a half gonna take it all out tommrow any tips on what could have caused this by the way i turned my idle screw basically all the way in same resuly still its a single adjustment carb with 1 main jet coolster model qg50