There is nothing wrong with the #35 size chain, it's been used on racing go karts for decades, at speeds and torque you will never see on your mini bike. Your problem is the chain you have is probably cheap chinesium junk, compounded by stamped sprockets that are less than precision and never run true. Add in a little slack, misalignment, frame flex and engine vibration and you have the situation you are in.
(I'm guessing this is a chinese mini bike..........am I right?)