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Why is My Friends Bike Smoking O's out of the muffler? Spark Arrestor Cleaning?

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Hello, my friend rides a 2001 YZ 125. He has an fmf q, the old version. When I saw him start it for the first time I noticed that his pipe was technically smoking O's out of the muffler and I thought it was really cool. I researched on it because I want my dirt bike to do the same thing but there is nothing about it. I thought it was just a special thing that the fmf q did, but I also hear that it has something to do with the spark arrestor being dirty and it needs to be cleaned. I need help, any answers?

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I had a 2003 kx125 with a FMF shorty on it that did the same thing it's just because of the excess fuel being burned causing more smoke and that is getting pushed out of a round pipe so it makes O's nothing to worry about

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It's a two stroke .... It smokes ..... If it looks black and wet at the end it it's probably time to change the silencer packing.

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