I've got two Stihl 661 magnums in the shop that where purchased this week brand new from the stihl dealer. Both of them cranked & ran fine on day of purchase, but after running them the first day, the next day they wouldnt start because they would flood after 4 to 5 pulls. Bad flooding. Today, I feel like ive pulled my arm out of socket trying to crank these machines. I drained fuel mix & put premixed in both of them. One started the other nothing but flooding. Im going out on a limb & guessing, that when I get back to the shop in the morning neither will start, or if they do, they will not crank after an hour or so. Any ideas?