Yes confucious say mark wires first, disconnected spark plug wires on johnson 50hp 4 stroke 2002 model and in my infinite wisdom didnt really pay much attention to where they went, so here i am 1st post alreay asking for help, the firing order please =(? top of motor to bottom please, whilst im here whats involved in a 600 hour service as mines done 596hrs, hasnt missed a beat till the forementioned............ doh!