Blue Flame

Today i was working on the bike(2011 SX-F 350). Let the engine warm up for about 5 minutes and revved it up a few times. When i let the throttle off i got a "pop" and a blue flame out the exhaust...similar to a backfire of a car. I know these things run a little rich for a while but is this normal?

Thats a lean condition when it backfires on decel.

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