I just changed mine and used Amsoil Metric Motorcycle 10w30. It is ma rated for wet clutches. I know there is anti Amsoil folks but I have used it in my 16 Honda Pioneer 1000 and has been great. One question is when on the center stand the bike wants to pivot forward. Which position do you check the oil? I leaned it backward, it seems to be more level that way.Anyone else find it odd that the manual calls for the same .7 liter as .7 quart after draining? It does show a difference for the quantity after disassembly......
As for synthetics, I've used Rotella full synth in my bikes for years, never had a wet clutch slip (supposedly the reason for NOT using synthetics). I like the long life feature when on a multi-thousand mile trip and no need to change oil half way through.
YMMV.