tzr50rossi

Hello! I have a Yamaha tzr 50 and i have bought me a New carburator a dellorto 21mm. The original tzr 50 carburator is 16mm and i must have 120 jet for not get it overheated or damaged only With a leovince v6 exhaust. How big jet do i need With a 21 dellorto carburator? it came With 92 main jet as standard. Should i use the big jet as 120 like the original carburator or must i have more normal jets like a 85-95 jet? The bike have no speed limits and it have leovince v6 exhaust, before its work fine With a 115 jet on original 16mm carburator.. I ask because im afraid to overheat or get damage to the cylindre if i not use big jets on the New dellorto 21mm? Be whery happy for answers!