+1 on those bullet style inline filters. I've tried the slightly larger paper type filters on a couple of bikes including the Ducatis I used to own which had low pressure fuel pumps, and the F650 with just gravity feed - not enough flow.
On the R80 and the F650, the bullet style filters work just fine.
I get mine at one of the local dealers since lots of motocrossers and dirt riders use lots of them. And I keep a spare on each bike just in case when I'm traveling. But I have yet to have one clog up.
Merritt Island, FL
When a person asks you for advice, they don't want advice. They want corroboration.