Or using crappy dollar store oil.
maybe trufuel as mentioned above?
stuffs straight garbage, so is motomix, VP Racing for the win on premix fuel, I've heard Aspen fuels are good too but ive never tried them
not to start the HP Ultra debate, but that oil is hot garbage too, only issues I've ever had out of any of my engines, either not starting, or scored/melted pistons, plugged up spark screens etc were all caused by motomix or HP ultra
Echo RedArmor is supposedly a really nice oil, AmsOil is fantastic, I've sorta heard the "high performance" orange bottle stihl oils are good but I'm not gonna buy any