Kazuma will not go forward

[trestunt30]

I recently got a Kazuma 250 I think. I installed new battery and key assembley its only turning on when its connected to the charger.when it is on it shakes back and forward . It rolls backwards . I try to give it gas but it shuts off . Do I need a new alternator so it will cut on with out being connected to the charger

Also I got some B-12 Carb cleaner and it seemed like it helped a little

****Pictures are on my page I couldn't load them from my phone

ALSO IT BEEN SITTING FOR I DON'T KNOW HOW LONG SO SHOULD I LET IT RUN AND LET THE CARB CLEANER GO THRU THE SYSTEM

[oxidized_black]

i would try to get it running fairly smooth first and see if you have the same problem with the forward motions. you could check the drive belt in the meantime and see if its worn and/or narrowed with wear. it seems the chinese brands electrical harness and components are not as reliable as the japanese. i would just try and get it running smooth and go from there, and yes, run the carb cleaner thru the carb and hopefully you won't need a rebuild kit or alot of heavy duty cleaning by dis-assembly ...