Irradiated; Use the method binary deduction as the Maestro taught. but my guess is that the timing is way off since it won't even run. If the timing checks out go to the carb. Sadly this is an example of a long distance purchase reinforcing "Caveat Emptor". No matter how many megapixels the photos have they can not show worn cam lobes, bent valves, bad layshaft bearings or any of the hundreds of other maladies a 30 year old bike is subject to. I suspect we're optimists at heart or we wouldn't be buying these bloody things in the first place (they were none too reliable when new) so when making a long distance purchase assume the worst and get everything in writing including a statement of condition if possible or better yet a warranty. Most reputable businesses will offer something to make the sale as well as keep their reputation clean. Hopefully you only have an ignition problem.