I picked up a 2013 scrambler 850 from a friend it has 800 miles on it, epi clutch, ripsaw tires, and a power commander. The epi clutch is way to rough for me so i ordered a QSC clutch kit from RVSperformance, great company btw. Also ordered some skid plates because i kept smacking mine. The steering stem where the EPS unit connects to the tie rods has play in the splines, i removed it and added two Grub screws, after one ride the play way back, is there any way to fix this issue?
Also should i be looking to replace the factory air filter with a more breathable one? i do not want a K+N will i need to re tune if i do so?

Thanks