Shineray gets too hot HELP urgent!!!

Halli, I urgently need your advice. I bought myself a Shineray used. 1 year old, but only 120km on it, 14 months warranty, I thought I could not pass anything. At the beginning small test drive at home, coolant comes out of the balance tank, well ok, sealed, since then fits, mmmhhhh 1. Drive in the morning to work everything palletti 2. Drive after 4km Temp display 75 degrees, fan goes on, machine goes off and smokes before towing, analysis at home: cable fire, have a screw found which has peeled up the wire harness and suspects that there has been a short circuit and the cable fire. Then the cables replaced by new thicker, test drive great. 3. Drive out in the morning after 12km, but at the finish 4th drive spark plug and plug installed before and again everything tested, seems ok, when starting jerk, only laboriously brought off, then it ran 5min. perfectly on stand (operating temp) After 1km 75degree fan, machine off!!! What’s up??? Does anyone have a tip? What should I do? Can all this come from standing around too long? The previous owner went home with the quad about 60km and it was nothing. Too much juice on a cable??