so towards the end of the 9th tank... the engine switched of.. due to the windy weather it was pretty tricky to keep the engine at 100-110c.. and the annoying thing that happened.. keep inmind im still running it in.., the piston got stuck just when it switched of.. so i had to get the top of the glowplug wrench and placed it flat ontop of the piston.. and tapped it gently2-3 times.. and clunk.. it came loose.. and all was fine.. , phew!.. .. anyway im of to finish running the half a tank.. and then go onto the 10th tank..