This model has a fuel primer located by the carb, Honda recommends a 5 minute warm up period. The choke alone will not be good enough. If you are, performing these steps you will need to look at other causes, if not start here. Oil is very important, know what you have and what you need, some oils will damage your clutches.
2008 TRX420FE 2A - FOURTRAX RANCHER 4X4 ES