Hi Fantakkas,
Also running in a YBR125...The manual says:
first 90 miles - Don't go above 5,000 revs,Stop after every 1 hour of riding to let the engine cool for 5-10 mins and no full throttle.
90-300 miles - Avoid prolonged operation above 6,000 revs, rev engine freely through the gears but no full throttle
300-600 miles - Avoid prolonged operation above 7,500 revs, avoid prolonged full throttle use and more importantly at 600 miles needs engine oil replaced (after 600 miles - GO FOR IT!!)