Engine Rebuilds

[Bishbash]

OK, just finished an engine rebuild(valves, lapping and the pistons) on the girlfriends bike. A mate of mine mentioned that I would need to run it in for a bit after the work that has been done. Is this true?
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My current bikes are - YZF-R1 & GS 500 E

Trackday videos - https://www.youtube.com/user/bishbash13

[Wafer_Thin_Ham]

It's the same dilema as to whether to run in a new engine or just hammer it.

Do whichever you're most comfortable with. Provided the engine's warm, riding it as normal won't hurt it.
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[Bishbash]

Cheers dude!
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My current bikes are - YZF-R1 & GS 500 E

Trackday videos - https://www.youtube.com/user/bishbash13