I need some help with my dyna S dp4000
first off I was wanting to know if the spark is suposed to hit all 4 plugs at the same time that just does not sound right to me
The reason I am asking this question is that I am expierencing a miss fire back firing and my front head is heating up normal but the back head is not the head is is only barely worming up

 

if the spark is suposed to hit all 4 plugs at same time then what is it that is going wrong?