While taking my shindawia apart for cleaning the piston crown I noticed the skirt was badly worn! cylinder wall is fine. the trimmer is two yr old I run 50 to one mix! stilh 2 stroke oil,i hope the piston will give one more season of work before replacing. It makes me wonder if i should use a higher oil ratio mix to lube the piston skirt?and wall.I wonder if due to EPA. for lower emmision call for 40 to1 or 50 to1! in turn might not really be good at all for 2 storke??