08 Honda 420 TRX will not start

Need some help troubleshooting an issue with my ATV, the engine will turn over when trying to start but will never hit and idle. When you turn the key on I can hear the fuel pump engage. If I turn the fuel dial to reserve then back to on I can get it to start and run for about 5 to 10 seconds. Looking for direction on how to approach locating the problem, any help is greatly appreciated.