Okay I found out valvolin Mortocycle oil 4 stroke works great I have an 1981 yz 80 and its been good to me..it specifically says good for wet clutches..
stock yamalube 4 stroke oil for the transmission only
15w/30 but that is hard to find so I use15w/40
yfz don't take transmission fluid its motor oil go to your local ATV motorcycle shop and get a oil filter and 2 qts of yamalube engine oil regular motor oil makes cluches slip change oil and filter every 20 hours
how much oil does an yamaha xt500 take
About 2.5 Quarts of 10w 40 wet clutch oil.
10w 40 wet clutch oil.
10w 40, I use vavoline for all of my bikes
250
10w-20
PW 80 is a 2 stroke. It does not have oil in the crank case. I think you mean transmission oil. I use 10w40 engine oil in mine and it works great.
4cycle
Chase Rocks