Oil Question- Just To Be Safe

[Doc Sprocket]

Hey- Got a buddy wants me to do some stuff to his ATV. It's a
'99 Yamaha Bear tracker. Aircooled 230cc, 4-stroke.
I am safe to feed this thing SAE 10W30, right?
Probably a stoopid question, I just don't want to be responsible for buggering up his quad... Thanks, guys.

 

[modelengineer]

Well, my air cooled 500cc specifies 10w40, but since it's REALLY hot here most people have suggested 15w50, which is what I use.

Whatever oil you use, make absolutely sure it doesn't have friction modifiers in it. If it does then the clutch will slip.

 

[Kaptain Krunch]

Every motorcycle i have worked on (4 stroke) has called for 10w40. Never dealt with an atv though.

 

[motor_head]

most places recommend 10w-40, but 10w-30 is fine

 

[Doc Sprocket]

Thanks, guys!

 

[EagleTalons]

I'd recommend 10w-40 due to the lubrication of the gearbox and the engine.

10w-40 is what I use in my 2005 Rancher which has a 350cc aircooled. It also says to use it in the manual!