welcome! cant see pics till you get a total of 10 posts on the forums.... check your compression with compression gauge... if it's under 110, you either have bad reads, fried piston rings or whole head kit all together... none of which are a very expensive fix... clean the carb thoroughly make sure you are getting enough fuel and air to the engine.
Read up on all the tutorials and posts of pertinence to your lbike model and style of engine.