Brother, forgive me if I sound a little rude; but you should ask this question to the dealer. Alternatively refer to the user instruction manual that comes with the bike...
Different bikes have different 'run-in' period. On a 70cc; you must not go faster than 50km/h. Whereas if we're talking about a Big Inch Harley Davidson with a massive 108 Cubic Inch V-Twin (thats equals to about 1,800cc) then you can go as fast as 80-100km/h!
Anyhow keep engine rpms low, try to get into last gear as soon as you can without choking the engine, accelerate slowly and change the oil on the recommended interval prescribed in the user manual...
Keep in mind: THERE IS NO UNIVERSAL RULE.
Regards,
Mr. Nine.