Hello. I bought a mini guada for my child with an engine as on alegro http://allegro.pl/silnik-pocket-mini-quad-bike-dirt-49-ccm-kompletny-i6425833175.html. The problem is that the son will drive for about 10 minutes and the quad goes out. It cannot be fired and it cannot be pulled at all by the puller as it was blocked. I will add that the engine is very hot. When it cools down, it will fire, drive 10 minutes and again the same. Could it be a seized engine? Was it enough to replace the piston with rings, or do you need the entire engine? I am asking for advice?