AIR FILTER
You can use the K&N airfilter in your airbox...but follow the insrtuctions and re-oil it like ou are supposed to...Purchase the cleaning kit at Auto Zone, O'Riellys, Pep Boys...the exact filter should be bought at the Kawasaki dealer.Just buy the BEST plugs that you can buy and use top rate gas not the cut rate gas. When I worked at Standard Oil years ago, it was taken back to a place and they added additives to it and "rejuvinated it" and then it was resold. I don't know who to, but I do know that the excess every 6 weeks or so was replenished. Standard/American/BP (now) takes the forecasted weather and formulates for things such as heat and humidity...that's all I remember from my classes when I went to school back 36 years ago. The other thing is that once you get the bike, not before, go to pure synthetic oil, as per your manual. Read up on the oils, and go with one that they use in aircraft, from hot tarmacs, runways, ramps and hot, hot, ot the extreme colds that are present at 40,000' ASL. You want the best, make a pass through an airport hangar where they service aircraft. Personally, I use AMSOIL in everything from my truck, to my weed-eater. just know that good/best oil does not require changes as early as crude oil does, but keep it clean, anyway.