02 426 popping back

My 02 "stock" 426 has started popping back "thru exhaust" on decell.

I don't remember it ever doing this before but now it seems to do it all the time. I know a "properly jetted race bike" will do this, but Its strange that I don't think it ever used to do it before.

any suggestions?

Same as always:

>Check for, locate, and correct any air leaks in the exhaust.

> Check for any causes of a lean idle mixture. Try backing the mixture screw out a half turn.

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