sorny said:
Ok, I know I sound retarded, but I just got a 99 YZ250, my first motorcycle EVER. And after draining the gear oil I was thinking, "How much do I put back in?".
Good vintage. I have one of those.
750cc. Basically buy a one liter gear oil jug and leave 250cc at
the bottom. Most of the gear oil jugs have a clear line that
show you the oil level left in the jug.
That's for an oil change. If you split the case then you'll need more.
If you plan on keeping this bike for a while you should spend the few
bucks and get a shop manual for it.
There is an oil level check towards the front right side of the
engine. You remove the bolt (when the engine is cold) and if oil flows out you are ok.
I would be careful about putting too much oil. That's hard on the gaskets.
miko.