Overhauling activities regarding the crankshaft, and consequently of the connecting rod, are very particular, as well as delicate (read the article that indicatively describes how a crankshaft is dismantled and reassembled). They act at the "heart" of the engine, where precision is to the hundredth of a millimetre. This is why it is very important to carry out the activities with the utmost care and attention, but, above all, using special and professional tools. This is the most expensive equipment kart drivers can buy if they want to manage the complete maintenance of their karts.