Hello friend, the calibration is so you must do it with the cold engine since the parts are dilated and there will be good ways to do it and the simplest is that of crossing you do that the two valves of one of the cylinders in a singleopo (footsteps) are left and then the one that crosses it for example: we put in just the cylinder number 1 then we Cylinder number 4 after 4 to 1 from 3 to 2 and 2 to 3