Chainsaw Repair

I've got a pair of Makita 7321 concrete saws I bought on the cheap .They are Dolmars model 73 something or another .One had the coil off with a smashed plug wire and the other a busted pull cord . I switched starters  and evidently no sparky so I'll switch coils and plug wires and go from there .

I know almost nothing about these things and have no idea if a saw coil will enterchange or not .I certainly don't want to spend the flea bay price of 135 bucks for a danged coil .