If the no start is due to too much fuel ether wont help, shut off the tank and try to start it, it may be over-pressurized. Is spark going to the right place at the right time? Check your cap I once had a Mitsubishi/Cat that would run, very poorly though, with the cap in my hand, your could see cross firing in the cap and when the spark hit the right cylinder terminal it would try to run, with the cap on the distributor it would not run, this cap only had 300 hours on it so I automatically assumed it was good. If you have spark, fuel, and compression the engine should run.