While fiddling (=servicing) I found the only non Japanese sticker on the bike.
It says DR250RS
Uncle Google is still clueless.
By now I have three setas of valve clearance specs:
Local shop & grey importer: 0.10 in. and ex. (me: ???)
NZ someone: 0.05 to 0.10 in. and 0.08 to 0.13 ex (me: sounds better but still pretty little clearance for a small OHC bucket valve train)
2 NZ Suzuki dealers: 0.10 to 0.20 in. and 0.20 to 0.30 ex (me: I would have trusted those right from the beginning would they just have come first!!!)