[Downgrade]

After riding for awhile, my bike idles really high it seems when Im at a light/stop sign when Im holding in the clutch, but is fine once I start moving. Im not sure what causes that, Ive tried to adjust engine idle, so its not so loud, but seems like it has a hard time idling when I first start the bike.

Also, the bike backfires when I turn it off after I ride it for 10+ minutes at 55-60mph, but only sometimes. Any ideas?