Need help 08 YZF 450

I have a 08 450 the bike seem's to be poping and backfireing when your are just off idle and when you get off the gas also i have played with the air screw it does not help what could it be.:cheers:

How many turns out is your fuel screw?

too lean on the bottom. it will get better when the temps go up. or you can richen up the slow speed circuit

the fuel screw is 2 1/4 turns out and also the bike is all stock with about 10 hr on it.

If it sat all winter, your pilot jet is gummed up. Pull it and clean it or replace it.

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