I thought it would be a good idea to clean and service my DNA stage 2 filter at 6000km after some off road trips.
The bike was having some slight surging between closed and open loop throttle positions. It felt if the air/fuel mix was not the same as it used to be.
So after cleaning the filter with degreaser, then soapy and clean water and let it dry properly, I sprayed it with an air filter spray recommended by a bike mechanic for this type of filter. It has an orange/pink color and he suggested spraying it just enough so the filter element was covered (inside and out).
It now feels if the A/F mix is even richer than before. It's heavier on fuel and the backfiring is much louder than before.
I'm going to redo the filter servicing with K&N filter oil spray, BUT I'd like to know how does one determine how much to spray on and does one spray on the inside and/or outside of the filter ??
The air obviously traverses the filter from the inside out

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2014 XT660Z - Barrett pipe, DNA stage1.5, Barkbuster hand guards and handlebars, Pivot pegs, Teknik suspension, Guard-it engine protector combo, B&B rear rack, Trax topbox.