That is sensible advice irrespective of whether the engine is under load or not. A cold engine means the oil is not circulating as effectively as it does when at operating temperature, especially in the first minute or so. Also, clearances between moving parts are not optimised and so more wear is possible.I have read thou on a few occasions that if this type of thing is done....you should not do it on a cold engine.
I don't think you have anything to worry about. Just don't let someone's kid ever do it again... make it clear that if he does it again, the beatings will begin.so let's say that I let my engine warm up for about 30 secs in about 44 degree weather and someone's kid decides he wanted to rev my bike to 9000 rpm. Any damage?
I think you should be okay. If it was on a repeated basis without any regard or care, then this could be something to worry more about. I have free-revved, but I personally keep it limited (can't say this was true a few years back when I was younger, lol). I personally think any negative effect would present itself if it were consistent neglect / abuse. In your case, it was just a rare accident, and you're already proactive in looking out for the health of your bike. No worries, I say.engine seems to run fine - I'm sure if I was riding anything other than a Honda I would be more worried. Just wanted to hear some confirmation that would ease my mind. Thanks