As stated many times my mentor and I have had problems with the engine. Every time we turn it on a new problem is reviled. This time a piston was burnt out. Instead of combusting the fuel, like it should, it would leak threw its sides. We have a total of three engines so it was just a matter of swapping the faulty piston and switching it with its replacement. I don't really mined having to take apart the engine multiple times, only because there is always something new to work with.