Hi am new hear & no sweet fa when it comes 2 these little 2-stroke engines... So I bought a 2nd hand "china" and was told by the bloke that his been runnin the bike without an exhaust manifold gasket! Can this cause & be a problem?? Considering that ive been experiencing few problems with her since having it, mainly starting difficulties, and have noticed 2 have a decent leak coming from somewhere..? Any info/advice will be greatly appreciated!