yeah i know it might bother him that ill be there,
Just so it's clear man, I think it's great that he's letting you do that, and I totally encourage it.
my point is that after i took the dirty coolant out the bike started right up, does that mean that its the head gasket? and all i have to do is change it?
i wonder why minutes later it just never turned on again, do u guys think its the coolant that mixed with the oil very quick
From the information you've provided, it seems that coolant and oil have mixed, and 99.5% of the time, this is the result of a blown head gasket. If it was blown before, it didn't get better, and you'd be hard pressed to find another explanation for the symptoms, especially given the overheat.
I highly recommend
that you do NOT start the bike again while the head gasket is still fouled up and the damage has been fully assessed.
That being said, here are 3 of the many possibilities as to why your bike wouldn't start after the flushing:
1. the temperature your bike reached was over 220F when it would not start.
2. A safety circuit was not completed (kill switch/tip sensor/ key/kickstand/clutch lever)
3. (hopefully not the case) water made it into your engine and did serious damage (unlikely)
oil in your coolant is bad, but coolant in your engine is worse. I understand that this situation might make you painfully impatient to hear it work again, but this isn't a quick fix kind of thing.
Take it slow, and do the right thing.