Need advice, engine being tempremental

[Hardball]

My RS 125 passed its mot first time and I've been riding it a little bit but all's not perfect. The engine sometimes cuts out whilst riding. This happened today and I switched from main to reserve on my fuel and it got me home. I thought it might have been because its low on fuel in the main tank, so I was gonna go to the station to get fuel and my bike started and then i out it into 1st to ride away and it cut out, and i couldnt get it started again for a few hours even with applying the choke. When I was riding earlier though, I let the engine turn over for 15 mins before riding it and managed to ride a couple of miles. Is this normal for an engine that hasnt done any miles since rebuild? do i need to leave it warm up before riding away?
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Previous bikes:88 Honda CG 125,00 Aprilia RS 125,05 Honda NXR 125 Current bikes: NONE!!!!! >

[unitynotsocri...]

Try posting in the workshop.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[Hardball]

oh ok, can an admin please move?
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Previous bikes:88 Honda CG 125,00 Aprilia RS 125,05 Honda NXR 125 Current bikes: NONE!!!!! >