2005 crf450, wont idle and backfiring

Just picked up another bike, its a 05 crf450, it will not idle on its own, not even with the choke on, when your riding it upon deacceleration it pops and backfires, I don't mean just a couple times either, sounds like a firing squad behind me, it will stall it gets so bad. So the question is does this mean the main jet us clogged up? Also it has a hot start cable going to the handlebars but no lever, could it be stuck open causing that?

Replace your pilot jet with a new one. It's a common problem on a neglected motor; gas corrosion.

If the hot start cable is there, try moving it. 

If it's bound at all, you will need to pull the hot start plunger and clean/lube it.

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