Want this question answered?
Yamaha 1981 YZ465H Engine
2 cycle motor oil
What it says in the manual
conventional motor oil .10w30/10w40.hot weather conditions,you can use 20w50
Mobil 1 V-twin
10W40 - Haynes Service Manual
Consult the owners manual for that info.
the owners manual recomends 5w 30
It should say in your owners manual.
10w-30 motor oil , source owners manual
90w motor oil
5 W 20 - according to the owners manual