Oh thanks - so many answers and informations.
Yes I have a tempgun and I will check the temperature as soon as possible and post it.
The truck weight is about 5,3 Kg and it is not stock (see pictures at
www.never2mu.ch ).
Until yet I have only one thermal shutdown, but I have to say it was a very hot day with outside temperature around 30 degrees celcius and I bash that beast so hard - first with a set of 14 cells GP3700 and then without any pause with a set of 14 cells IB3800 - every set holds only arund six to eight minutes - so you can image the drivestyle.
When I drive "regular" there is no shutdown - runtime something between 10 and 15 minutes.
So the best would be to check the temperature with the tempgun and make a try with changing the pinion gear to 14.
I will post my experience as soon as possible.
Thanks again and with greetings from Germany
harald-hans