Don't let your bike just sit there idling. The choke circuit is needed for initial start-up.
If you leave the choke on, when it warms up a little, the choke circuit is putting to much fuel into the cylinders. The added fuel doesn't get fully ignited and just sits in the exhaust pipes. When you get on the throttle, the unburned fuel in the pipes gets ignited and explodes, causing the backfire.
Use the choke to get the bike running. You should be able to start riding after less than a 1/2 minute. And during that time the oil is well circulated to lube all internal parts.
As you're ridding, slowly turn the choke off in increments. As soon as the bike will idle on it's own, the choke should be off to prevent an over rich mixture and foul the plugs.
Plus you're well into your ride and have saved a little on gas mileage.
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