I keep having to tighten the bolts on various parts,why?
Mopeds vibrate, thats all there is to it,some much worse than others, the only help for this is to use either nylon locking nuts,or shakeproof washers(toothed washers,internal or external) or some form of loctite thread locker, use caution with loctite and only use the color you need for what you are doing with it, some colors are made to be removeable(blue) some colors are made not to be readily removable(red) and can create problems with disassembly,or simply stop you from being able to take it back apart without destroying the part itself.