6 HP Nissan rope starter slipped. Wont crank to start now. Any suggestions? Also, it takes a lot of pulls to get it warmed up and going. Almost threw my shoulder out the other day. I had some bad gas in it and burned all that stuff up and am using ethanol free fuel (tru-fuel) but it was still struggling to start up. Kept pulling to get it going and then boom rope starter slipped out of place. Any help or suggestions is appreciated