Hi,
Yesterday (20/12/12) I managed after several months of hesitation replaced the oil in the drive unit. It was one of those jobs I kept putting off. Honda recommends an 80 grade oil but I had a Castol EP 80W/90 at hand so I used that. So far no leaks.
I had the oil and the funnel but needed a plastic tube for the end of the funnel. Well, it's all done until I get to do it again.
Considering the bike has done 135,000 kms and the drive oil has only been changed twice. The last time at 60,000kms at one of my tyre changes done by a dealer.
Alan