Hey dude,
By the sounds of it, the motor is about as good as a paper weight!!!!! The motor looks like an older generation novarossi.
Check out this website at
www.rayaracing.com. Ray is the king of pinching. Send him the piston and sleeve and he will bring it back to life. You can't go wrong for 20.00 or so.
Ray has done all my motors for the past ten years.