You could tap the filter on the ground to loosen any dirt and than vacuum out if you like.You should only clean the chain with kerosene as not to damage o-rings.I like to use a aerosol spray lube as it penetrates better & is cleaner.A smell of fuel & a small amount of "blow by" in the air box is normal,that's why there is a drain.You just got to be sure to reinstall the drain plug or the bike will run like crap.You don't need the "special Tool" to adjust the valves.You can use a Shrader valve (valve stem remover) or the head of a Robertson screw screwed on to a length of dowel will work well.
:2tup: