Mainjets for the TM carb, that's what you'll need to set your engine up properly. You usually start with an overlarge mainjet. This will cause the engine to missfire (fourstroke) on full throttle. You then gradually decrease the mainjet in size (in steps of 5) until the engine starts running properly. Fine tuning is then achieved by juggling around with the in-between sizes. Be careful: too small a mainjet will result in a lean mixture and piston seizures.
Be careful: these jets are only for Mikuni TM24. For Stage6 TM24, you will need the respective Stage6 mainjets!!!