1975 Yz 125

I got some more info, turns out its a 1974 or 1975 MX 125 not yz, i got her started, blows some smoke though. I need to replace the gear oil, does anyone know what to put in there? My manual hasnt arrived yet.

I just picked up a complete 1974 YZ 125, for $300, and it runs! Its in Pretty Good Shape, most all parts useable. Im having a hard time finding info on it, and parts. I need a gasket kit, and so far only bike bandit sells gaskets, and their individual (around $5-$10 EACH) which will get expensive real quick. I would like to find just pictures, so far ive only found a red/silver one, and mine is yellow. Any help would be much appreciated.