If it doesn't start but turns over ok. It may be a problem with the magneto / wiring or spark plugs. It seems as though this unit has no automatic shut down. I would try replacing the spark plugs BPR4ES NGK or equivalent and gap to .030, oil 5/30 or 10/30 will do takes less than 1 quart, & air filter (basic tune-up) if not performed in some time. Yamaha recommends every 20 hours. Then try again. Here is a link to the owner's manual. http://www.poweredgenerators.com/yamaha/manuals/ef2400is.pdf
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