Backfiring in acceleration and deceleration on YZ400f?

Well, my bike sat for about a month, and when I took it out one day it began backfiring a ton in acceleration and deceleration. Is it time for valve shims or is there something else that can go bad? Let me know

Thanks

Cole

The most likely culprit is varnish from evaporated fuel blocking or partly blocking a jet in the carb.

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