I don't know about "Must do". I added SWMotech crash bars, as I can barely get the balls of my feet to touch with boots on. I also added a JNS skidplate, fmf slip-on, and the KLR tailbag (which carries slime for tube type tires, trail side jack and some CO2 cartridges).
I have a 2016 model. A couple months in one of the lower subframe bolts broke. This is apparently a pretty common problem. So you might want to replace at least the lowers with better grade bolts from your local hardware store.
There is NOTHING you NEED to do though there is a fair argument for an Eaglemike doohickey with torsion spring by 5000 miles or so. EVERYTHING else is optional though some will also put the Thermobob (which is a great mod) in the "necessary" catagory as well.
There are a hundred things you COULD upgrade, but the need for that depends on you.....you're usage, experience, expectations and budget. I've done dozens of upgrades to both my KLR's and I think most of them are important for me......but everyone is different.
Modifying KLR's is a slippery slope! Fun, but it can get addictive and mildly expensive. ;-)
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