First, please try to understand what is meant by engine break-in (or runin as we also call it). The link http://www.ntnoa.org/enginebreakin.htm gives a fair idea of how the new cylindrical blocks are designed or how they are rebored to seat a new piston ring perfectly.
Out there on the webs, there will be two diametrically opposite views on how to breakin a new engine. One will say, drive hard and another will say drive gently. Fortunate part of the modern engines is that the manufacturing has improved vastly and either way you follow it wouldn't harm much. However, you must always avoid firing the engine before it is warmed. You can start driving gently before it is warmed, but wait till it is warm if you want to fire, because the lubrications will perform well only after a certain temperature.
I have fired my new two wheeler as well as two new cars. They have done great (latest being Linea MJD with 15500 Km on odo now).
While there is no perfect way to say whether the breakin happened perfectly or not, one easiest way to check is to check the engine oil level after say 10000 or 15000 Km. An improperly broken-in engine will burn more engine oil and also contaminate the crank shaft area and thus the engine oil (as also explained in the link above).
If you ask me, I would say, don't fire until the engine is warm. You can fire it whenever you want to. Note that new tyres will be a bit slippery and also you will need time to get used to the whole vehicle (engine, brake, etc.), so be cautious.
Never drive in a higher gear in slow speeds if it causes the engine shuddering or lugging. This is very harmful for the engine.
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