So i have a 2017 coolster qg50 recently been having alot of problems finnaly got all of them fixed except this one i dont get at all recently just went out for a ride and when i pull on the pullstart the back tire moves with the engine and locks up sometimes so i think maybe its a clutch problem i take the clutch cover off sure enought find a broken clutch spring so i got a new clutch pad and springs put both new parts on put everything together bike still does the same thing a few weeks ago it was doing that when i started it the bike would go byitself no throttle touched now its doing it this time and i dont knkw what else it could be i greased everything sprockts chain in the clutch and out got brand new Clutch spring and a clutch pad so i dont see what is causing this and this morning i did a little experiment took the chain off fired her up the engine revs where so high i thought my piston was about to blow its full on bouncing off rev limiters and it cant be a carb issue because i cleaned the carb jets and all and plus if i move the backtire it engages the motor to try and start