If you keep your bike stock you will not need to change the jet unless you live at sea level or high elevation were there would be a slight chance that you may need a smaller or larger jet.
On the stock bikes it has been found that they run lean from the factory for most people. You can correct this be moving the c-clip on the carb needle toward the pointed end. Also adjusting the fuel screw to about 2 turns out helps. These two things help with starting/idling/revving in stock form.
If you decide you want to run a pod filter like a UNI or K&N you can probably get away with the stock jet yet. When you go from the stock exhuast to a more open exhaust and the pod filter is when you will need to rejet to a larger main jet in the carb.
I have a UNI filter and a pretty much open exhaust on my bike. I moved from the stock 98 jet to a 108 main jet and could probably go a bit larger.
The torque is improve, but the bike is loud above 5500rpm.
Allen
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