I started my first full week of mowing and ran across a problem with both my br400 and echo srm2400sb. I did all my spring clean ups with them and they worked fine. I recently bought gas and bought a 5 gallon mix for my 5 gallon safety can i use. Every account i got too, borth the blower and trimmer were rough starting, and i had to stab the throttle and lightly ease into it to get them up to speed. any suggestions on what is wrong? could it be bad gas, or something wrong with both of them? both have been serviced and got new filters plugs etc..... any ideas? i asked someone else, and they thought maybe the motors were binding up? ive run 50:1 mix in them from day one with no problem.