CHECK COIL ON WEEDEATER

Most likely the isue is too large plug gap. The proper gap is 1mm, set the gap first then if you still want to check coil output take the plug out hold the base of the plug to the cylinder head pull the start rope and look for a spark. If you can't see a spark seperate the plug base from the cylinder with your finger pull the cord, if it hurts stop pulling the coil is good! If you dont feel the shock then the coil may be defective however there is a couple of electrical conections to check first. If you already have access to the coil and have an ohm meter check for a low resistance (below 10 ohms) across the coil wires.