What weight gear oil?

[jerry and sons]

Don't have a manuel for my bike, but I would like to change the tranny fluid. It is a 03 yz250 can anybody help with waht weight gear oild I should be using?
Thanks

 

[captblue1]

ATF type F can be used and many poeple use it.

 

[DLHamblin]

Don't have a manuel for my bike, but I would like to change the tranny fluid. It is a 03 yz250 can anybody help with waht weight gear oild I should be using?
Thanks

I use Bel-Ray 80w Transmission oil.

 

[jackdrinker]

Any non-low E, motor oil, straight 40w or 50w..
Look on the back of the bottle, you'll see an SAE number and if it says energy conserving it's low E, thats not what you want..