I have a 3250 watt Kingcraft generator that won't

Always troubleshoot with new sparkplug. Remove the oil sending unit connection from the coil. The coil should work without any wires connected. Usually the only connections are oil sending unit that will short to ground when low oil condition and other wire must be kill wire to on/off switch. Use carb cleaner spray directly into the carb with air filter removed and choke off as fuel supply. Just a short spray and another short spray after a couple of pulls. If engine wants to start you will need to keep spraying cleaner for engine to continue to run. If engine wants to run, replace fuel with couple gallons of premium fuel to get it going. Hotter fuel will help if the compression is low. Good luck