Are you talking about "backfiring" out the exhaust or "spitting back" through the carb?
Backfiring through the exhaust under acceleration is rare. If he ignition is misfiring, unburned fuel and air mixture is exhausted into the exhaust system. The next time the plug fires, it ignites this mixure. In other words, your engine is "missing" and your ignition system needs attention.
If it's "spitting back" out of the carb, this is usually an indication of a lean mixture. If it's doing it at wide open throttle, you might need to go up one size one your main jet. If it's doing it under less than full throttle acceleration, raise your needle up one notch and try it again. You want to richen the mixture just a bit. Too much and the bike will get sluggish.
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