1. Take care of the carb. Rebuild as needed, clean it but DO NOT buy the cheap imitation replacement carbs on Amazon... you'll end up regretting it. Use Mechanic in a Bottle every now and then, and before storing.
2. Wire snafu under the seat. Had intermittent running issues, starting issues, lights... Long story short I eliminated the stock "block" and rewired ALL of it with individual fuses. Never looked back.
3. Brakes - Stock suck. Even with replacement parts, they still suck. Disc replacements are viable, but I have yet to bleed them so they actually work.
4. I haven't done it (yet), but converting to a manual shifter will save your back from the clunky e-shifter.
5. Engine - change oil often, and it will last longer than you'll ever need.