If i had a new basemodel v4 to mod for track usage i would probably start off with,
Throttle spacer kit
-Brake pads, i like SBS Dual Carbon
-Brake master, i use a 19x18. 17mm master is recommended for stylema but all personal preference how you like the brakes to feel
-Race brake fluid, something with a wet boiling point of 205 degree C
-Rear shock. Ttx, Ktech, Mupo, Bitubo whatever shock you like, fits your budget and you can have serviced in your area
-Respring front forks for my weight.
-Change rear sprocket for gearing to suit your track if necessary
Somethings are less performance specific oriented but being comfortable can make a big difference in confidence and feeling so depending on the person, things like
-rearsets
-clipons/bars
-taller seat
-taller windscreen
After that you could do
-Fork cartridge kit
-S model wheels
-Exhaust/tuning
Something V4 suffers from a lot is overheating or running very hot so an aftermarket race radiator could be beneficial. And also always see issues with the quickshifter so maybe an aftermarket replacement sensor like Translogic or Cordona could prevent future headaches. There are many more upgrades still but with these mods above youd be pretty set
Tires you can use anything thats track oriented from street DOT like a Q3+ or S22 to a full slick setup. Whatever suits your needs and skill level. Always do the tire calibration what fitting new or different tires. Check manufacture pressure recommendation as a starting point but you can adjust as you see fit and dont be afraid to try different setups. Id use warmers on all tires, if you get adjustable setting warmers then you can run them at a lower temp for street tires and not cook the crap out of them.
