Think of a dyno run as a guide to where improvements may be made. Lot's of us re-jet based upon the seat of our pants, so to say, AND by looking at the spark plug color and observing throttle response, observing exhaust color etc. The Dyno, graphs out your power band so you or a more learned one can guide you on jet sizes, need for needle shims, etc.
Does Dyno[ing] a bike eliminate the need for a jet kit? No and Yes. If you are
there, yes, if you aren’t then no. When you dyno a bike do you use the stock parts within the carbs (jets, shims, etc...)? Again yes and no. Generally when you are tweaking your ride it is because you have changed something. Pipes, air filter, air box elimination, BIG BORE. Even if your bike is stock, the use of the dyno will most always show you that improvement may be made, in air mixture setting or jets, or needle/shims or a combo of all.
So if ya want to dyno your bike, be prepared to re-jet (buy some socket head cap screws for the carb bowls and tops). Re-jetting guides exist and most after market pipes come with a jet kit. This forum has suggestions. So if you have changed something re air intake or exhaust (pipes) then rejet according to the guidelines that others have laid down, but do be prepared to re-jet when you ride to the dyno shop. That is to say have some jets in smaller and larger sizes available so you can swap them out and re-dyno. Have some shims too? Have some new plugs also…
PS: There are no stupid questions!
