must have been a fueling issue stuck the long lsn back in and she ran like a champ and exactly the same for 25 min. My mephisto gt5 was built feb 13 and came from walter hobby in Oz i wonder if a running change was made or they are slightly different when sold to a "hot" climate. Or typical nova throw whatever parts are around at the time in it LOL. Im actually running it in a 1/8th truck offroad 41033/2108.it was running awesome the first race of the year but i ran out of my usual fuel and they went out of business at the same time so had to switch, fuels the tank got changed for the first time at the same time and i just assumed the tank sealed well as it was new. should have known when everything gets super wonky check the fueling system first, then clutch, then the motor.