If you could choose any year YZ125 engine and YZ125 chassis to put together, what years would you go with? yamahamotorusa came out with the YZ125 for the 1974 model year, it got liquid cooling in ‘81 and a power-valve the next year, a case reed engine in ‘86, inverted forks and 19” rear wheel in ‘89, aluminum frame in ‘05 with the SSS KYB’s the next year, ‘15 had updated plastics, 2022 got an all new engine and updated body. No matter what year yours is, go to motosportinc to dial in your machine to keep the fun alive. You can imagine the parts I go through on a 125 ☠️😂 redbullusa redbull redbullmotorsports motosportinc rdrco.inc allballsracing_ bbrmotorsports #YZ125 #yamaha #2stroke