smoking head pipe

my raptor 250 starts smoking on the headpipe after i got bogged down in a mudhole. after i cleaned it off it started to rust, so i sprayed wd-40 to get it to stop. it worked but it starts smoking. how many days do i have to wait if it was last saturday. i tried it two days now and i cleaned the wd40 off

did you wash your whole quad down and get all the mud out of the engine as good as you could? and did you get any water in your exhaust?

yea and no

it stopped smoking