Anyone out there had this problem? I have a Derbi GPR 75 that now has a very deformed gas tank. The dummy tank appears to be made from a type of thermo-plastic moulding. The other day the bike was in full sunlight with temperatures in the 90's this appears to have softened the tank material so that the spring that is located on the underside of the tank to hold it open when unlocked tried to push itself through the tank!
So in closing park your bike in the shade or cover it in some way. I doubt the factory warrenty covers this!!!!