If it is burning oil I would expect to find some residue around the exhaust outlet and possibly nearby bodywork.
Its just one of the many oil burners - don't let it worry you, mine did it loads , had the rings replaced as it was drinking oil like nothing on earth - the oil use dropped but it still blew smoke at times. Mates have ripped the p!ss for years out of my bike - but the engine had no wear on any parts after 75k
If you open your engine, go with afetrmarket piston and a new cylinder block just changes the rings don't solve anything.
Well I hope it's just extra oil really but if it does cock up. Il have a nova box and cams while there
Does it smell like oil ? could it be over fueling on full throttle ? blocked or restricted airfilter ? bad map ?