Yes they do burn a bit of oil.
Yamaha set a guide of up to 1 litre per 1000 miles.
If it was more, then they would replace the barrels, pistons, rings and gaskets under warranty.
Bloody good bikes though
I loved mine. Kept her for 5 years and never had any problems.
Great handling depending on the tyres fitted.
Had mine on bridgestones and it was great, but it hated pirelli's and dunlops. They totally screwed up the turn in.
I hope it's a goodun for you