You have had so many problems with your motors that I frankly have lost count of just how many.
The only reason that your exhaust gasket leaked and busted is because your not going over your bike often enough to tighten down loose nuts and bolts, even on a pedal bike things are constantly loosening, 10 times more so with a motorised bike, you have to constantly check and tighten things with these, they are not like buying a Honda motorcycle or an old Honda Cub 50 where everything just keeps running no matter what.
We are not just joking when we talk about cheap Chinesium quality with these motors, but we also leave room to mention that some are not mechanically gifted enough to be able to build and maintain these little puppies the way that is necessary to keep them running without running into constant problems.
