The first thing you need to check is if you have a spark at the ignition coil?

To do so remove the king lead from the dizzy and hold with an INSULATED pair of pliers a few inches away from a good ground and have someone turn the engine over.

You should see a healthy blue spark jump the gap, if so then the coil and wiring is good.

Next make sure you have fuel reaching the engine, after that you need to work forward as to checking as to whether the spark is reaching the plugs themselves.

Martin