I have experienced the same difficulty; here's what I did. Turn the engine over by hand while watching for the timing marks in the little window; they are really there. Once you find them, clean that area of the flywheel well and then you should be able to see them with your timing light. On my 3 cylinder 4000, I actually had to pull the starter and turn the engine over with a big screwdriver. You will love the electronic ignition. You will need a good battery and a healthy electrical system because if the system voltage is pulled down below about 4.5 volts, the electronics won't fire.