Gear cluster for LML reed valve cases

dear sip scooter shop,help me! i’ve just try to assemble my new px engine with LML reed valve cases, but my old Gear cluster of my 84 PX125,  is too small diameter than cases holes! I have think that i need a new  Gear cluster from '98 and later engine. Coul you tell me what is the right gear cluster, bearing and the necessary to run in my lml cases? Thank you

i’ve an answer! My old px engine is not a px! it is a Ts or sprint engine.