A quick and dirty way to tell if the coils are dragging is to remove the spark plugs and slowly crank the motor over manually while watching the magneto plate under the flywheel. A bit of wiggle isn’t too alarming,, but if it wants to grab and try to rotate with the flywheel, well there ya go. If they are rubbing, the flywheel has to come off for inspection. Could be anything from coils mal-adjustment to a wobbly armature plate, to a cracked/bent flywheel.
Note the red-circled burn mark on the coil heels in the picture. Caused by heat from rubbing.
