to check the coil take the main lead off and earth it on a bolt as i mentioned before make sure not to spark yourself though, it can give you a nasty jolt, not to serious though,if there is no spark the coil is either buggered or the wiring isn't right. If you say you haven't touched it(the coil) check the dizzy wiring and make sure there is power at the dizzy, test light or multimeter will be fine to do this.