Crackling and popping noise when coasting

[jherder]

I got a 2004 yz250f and whenever i let off the throttle and coast the bike makes crackling and popping noises out the exhaust. If i give it the slightest amount of gas it goes away. The noise is much louder than most other thumpers that i've heard. It has a pro circuit ti-4 exhaust system on it but it does the same thing with the stock exhaust system. Any help is appreciated.

[joe_power]

this is normal when you have an after market exhaust on. you need to adjust you pilot jet, make it richer because its slightly lean , if its hard to start it could even be blocked ,, if you search the forums , there is lots of info on carb setting for your bike

[barton]

A bit of popping is normal, but if it's excessive, you may be a bit lean. Usually this is the pilot circuit, and you can try opening your fuel screw a bit to see if it lessens. If that doesn't work then try dropping your needle clip one position.

[Way Fast Whitey]

if your bike pops when you rev it with the clucth in its really lean, try that if you start it up soon, mine pops like a son of a gun, the pipe just makes it louder.