Customer bought me this blower BG75,said it would not start.I change the plug,it ran for about 30sec.and now it won't start.I check the muffler and the cylinder,has some light scratches,and the rings are free,not stuck.The compression is 80#.I put about 1/2 ounce of 2 cycle oil in the cylinder.it pop 1 time nothing else.Most blowers I have work on the compression was 90# or better.This is the first stihl blower I have worked on,all other were cheap blowers.Appricate your thoughts.

Jerry