Chainsaws

Why does my 440 not start? purchased on 08/01/2013, went to use it in October. Would not start, took it back to Lowes. weeks later they call said I used bad gas nothing wrong charged me $60. used Husqvarna pre mix 50:1 in it first time and again this time still have to pull 60-80 time before even a pop. its not me I have other equipment that runs great. who is going to make this right Lowes thinks I should send it out for repair on my dime. what ever happen to mfg warranty its brand new