exhaust turning fender brown?

I have a 09 yz450f it has a dr.d header pipe and fmf slip on. I've had the bike about 3 months. About a month ago I put white plastics and new graphics on it and I've noticed the rear fender on the exhaust side is turning brown... could it be jetted a little rich or? It runs great. I ride it every weekend at the track haven't had any problems with it since I've gotten it. Any insight would be much appreciated!

Just sand it down a little and melt the plastic with a a torch and it will look brand new

OK but do you think it's running rich?

I have a white 09. I don't know what is causing the discoloration but a magic eraser sponge cleans the white really well. It may take some of the shine away but removes stains.

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