Razor Pocket Bike

I got a razor pocket bike but it got really slow so i decided to strip off everything to the frame. I want to know if its possible to fit any kind of motor in it thats gas?
Also, my back tire is flat and i dont know if its just popped or deflated but i cant get to the air pump thing. The sprocket is in the way and i cant seem to get it off, what do i do?

dunno about the motor, but about the back tire, look at the right handle (throttle handle) there should be an extender made of plastic in there...

you can easly put a weed eater motor in it... but its not really worth the hassle becuase of all the fabing you have to do...

as for the back tire... just take off the sprocket with a 10mm wench and a 5 alien wench