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I once had a bike with that problem.
We finally tracked it down to a bad needle valve in the carb.
While it was sitting, gas would get past the carb into the cylinder.
On first spin over, gas in the exhaust would ignite, giving the Gunshot "Hey are you awake yet?"
Try turning the fuel supply valve off when you're going to park it for a long time and see if the problem dis-appears.
Sounds to me like your running too rich, IE - theres too much fuel being burned as opposed to air. I'd check and make sure your airfilter isnt dirty, anything that restricts airflow can cause this. Dont leave the enricher on once the bikes started up...make sure you have the right plugs in there