A few questions,

How must oil should I have in the r1 98/99
How have people been checking the level,
How often do people top up.

I top my 5JJ up to the top of the window when not running, it runs with the oil half way up the window.
I've had no problems so far.

I do get a lot of oil vapour from the breather, but nothing in the catch tank.

If I do a track day, i do have to keep an eye on the oil levels, and top up.

Hope this helps

Steve.

CHEERS STEVE