how do i get to the spark plug on a 49cc peace sport ?

No.

You may have to take a few panels off to get to plug. If your not sure where it is follow your exquast pipe into engine and this pipe goes into cylinder. Plug sits on top of cylinder.
Get some decent tools and be careful when taking plug out but esp when putting back in. Dont force it. Sounds as though it is electrical so hopefully a new plug will solve it.

BB
May 2009