Actually, if it has something to do, because if the valves do not go correctly or open or close non -synchronized with the movement of the piston, it is possible that the MESCLA escapes CUDRA since so that a correct combustion is performed in the cylinder, it must find in the upper dead point and the two closed valves, if it does not accent well it escapes and produces this smell, to fix this problem, you also solve this problem. Sobreposição de que é o momento em que as duas válvulas estão abertas e ocorre uma varredura dos gases, você deseja ter um sistema descarbonizado e com essas soluções.