03' 600 Sprtsman will only fire for about two seconds

Sounds electronic?? Like whatever supplies the spark is going bad, and resets itself every time you cut the key off. I bet before long it will quit doing that and stop firing all together.

Yep sounds like you got an electrical bug. Maybe the ignition is going out.

definently electrical and it will finally stop firing all together(had same problem) we have an 03 700 sportsman and had to put the whole updated wiring harness on it.... its only about $50 more than the stator which has been giving alot of problems on the 2003's

IDK about a Polaris but a Honda does that when the voltage regulator goes bad .

just going by wat the dealer told me and took his word for it

I'd check the voltage comming out of the ignition switch first...and then go and check the CDI Module ,thats what supplies your ignition charge to the stator which fires the the coil to your spark plug...there's a few tests that can be done...If you don't have good voltage you'll get weak spark...I'm thinking you may have a weak stator and its not sending the correct voltage to the CDi..It's just a guess..Muddie49

Sounds like the coil to me because i had a honda rancher do the same thing.