Homelite chainsaw ut 10516 won't start have replaced all electrical parts still no spark why?

i have replaced all electrical including switch and have disconnected wires to coil so as not short out...still no spark...set air gap to .10 with business card...no spark have tried 3 new coils and flywheel...no spark??? i have replaced all electrical including switch and have disconnected wires to coil so as not short out...still no spark...set air gap to .10 with business card...no spark have tried 3 new coils and flywheel...no spark???

'Tis an enigma!!!!!U have tried everything and still nada - no wonder you are going bananas! Only thing I can think of is the wiring going to the on/off switch. If one of those legs has insulation that has worn off and the ***** wire is grounding out, that would kill the spark. There is nada left to check since you have replaced the coil with 3 others (hopefully one was good), gapped unit properly. Sounds crazy but did you check out the plug and try a known working one? Does the chainsaw have a dead man switch that has to be on the "on" position along with the trigger for unit to operate. 'Tis an enigma!!!!!U have tried everything and still nada - no wonder you are going bananas! Only thing I can think of is the wiring going to the on/off switch. If one of those legs has insulation that has worn off and the ***** wire is grounding out, that would kill the spark. There is nada left to check since you have replaced the coil with 3 others (hopefully one was good), gapped unit properly. Sounds crazy but did you check out the plug and try a known working one? Does the chainsaw have a dead man switch that has to be on the "on" position along with the trigger for unit to operate.