All the Yamaha PW80's and PW50's are 2 strokes, so they dont have engine oil. You mix 2 stroke engine oil into the petrol using 25:1 mixing ratio as im pretty sure you know this already. But they do have transmission oil. You can use 4 stroke engine oil for this, or alternatively, use proper transmission oil.
One may buy a used Yamaha PW80 from Cycle Trader. These are private sales but one may often get a better deal this way. One may also use Kijiji to purchase a PW80.
Any 4-stroke 10W-30 motorcycle oil can be used in clutch case.
Yamalube motor oil
Yamaha's Yamalube, 2 stroke oil is a good choice.
2-Cycle Engine oil.
Yamalube or rottella t. Its designed for the clutches.
In a stock PW80, there is no need to mix oil with the fuel. The oil is injected into the carburetor throat by the oil pump. The factory ratio is estimated to be about 24:1, which is quite rich. On bikes with the oil pump disabled, ratios as lean as 40:1 have been tried with success. The optimum ratio will ultimately depend on the elevation and the jetting used There is an oil tank under the seat
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