smoke from side vent?

[Fazer]

new Box owner enjoying ride but got a few issues.
getting some smoke and a strong smell of burnt oil coming from the
passenger side air vent in front of the rear wheel. RMS was done before
I bought it and I was told there would be some residual oil still burnt off
but that was 8 months and 4000 miles ago. it doesn't smoke all the time
but about once a week in daily driving. no oil leaks noticed on the ground.
any suggestions?
also looking for recommends for a new set of tires. weather on Canada's
west coast is WET. wet traction is paramount. considering Goodyear GS D3.
Advan Sport or Falken FK452. tread life would be nice too, so leaning away from
PS2 or Pole Positions for this reason.
learning lots on this site so far, thanks to everyone!