Its a Stihl fs 45 trimmer and when I hook up a spark tester to it it shows I have spark but when I take the plug out and ground it to the engine i don’t see a spark. My guess is that the coil is weak and the spark won’t make it to the plug. The plug itself looks new and I try other plugs that should work and I don’t get a spark. I did gap the coil with a business card so I don’t think that’s the problem. Also the magnet on the flywheel is not dirty or rusted
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