Gy6 150cc won't start.... not another one!

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Welp, got my first scooter it is a VIP Future Champion 150cc and I bought it knowing it wouldn't start thinking hey, it's a simple engine, well after about 2 weeks of doing everything I can find to do I can't get it running, it has a new cdi, new plug, new plug wire,new carb, fresh 93 octane gas, just adjusted the valves and timing, I've tried playing with the fuel to air ratio,the idle, nothing, it will turn over, occasional back fire, but wont start. It doesn't have am exhaust on it and I have taken off the air box to make it easier to work on. Please help. I've cleaned the carb thoroughly also.