You have to read the user manual and then concern your mechanic.
Yamalube motor oil.
For a 2004 Yamaha Bear Tracker 250, it is recommended to use a 10W-40 oil that meets API service classifications SG or higher. Yamaha's own brand of oil or any high-quality motorcycle-specific oil is ideal. Always check the owner's manual for the most accurate specifications and recommendations for your specific model.
I use 10W30 in my 1989 Yamaha Warrior.
1.13 liters
yamalube is the best
10w-40
21/2qrts 20w50
what type of oil should i use when i cange the oil in my 2006 banshee Belray Gear Saver,75w #93150 10W30 motor oil, says in the Clymer shop manual for the Yamaha banshee. 1987-2004. but i use belray gear saver 80W, meant for 2 stroke transmissions.
Use 10w40 4-stroke motorcycle oil. DO NOT use any type of automotive oil; motorcycle oil is needed because of the wet clutch.
trochoid
sae 30
winter- 5w30 summer-10w30