Exhaust Help

I'm having a problem with the exhaust studs and exhaust pipe on my Occ Chopper 66/80cc motor ... I have replaced both studs 3 times already using the correct thread and stud and i still have a problem ....



After riding my bike mostly 2 times , one out of the two studs fall out and then the exhaust pipe is hanging by one stud the rest of the way home

I was wondering if there was any other Exhaust Pipe Out there for an Occ chopper or Is there another way of keeping the exhaust on ??

Any help is good Thank You

I never thought about using loctite ... I'll head out to the store and get some and try it out

Thanks For The Help Guys