I have an 86 and I use supreme gasoline in it. Octane boost is good once in awhile too!
I use 10W30 in my 1989 Yamaha Warrior.
10w 40 wet clutch oil.
About 2.5 Quarts of 10w 40 wet clutch oil.
Yamaha Blasters take unleaded gas only.
take the cover off pull the old ones off slide new clutch on then put the cover back on.
A yamaha warrior does not have a timing. If it is backfiring like mine you have to get a diagnostics and something in the electrical system their is a switch that is turned off. IF you take it to a shop it will run you about 80-200 $$. I learned all this yesterday. Hope this helps. Antonio H
15w/30 but that is hard to find so I use15w/40
warrior 350 runs on wet clutch, the crankcase oil lubes the clutches
b8es NGK
10w 40, I use vavoline for all of my bikes
10w30
how much oil does an yamaha xt500 take