Quote:
Originally Posted by Evil Vegeta
Goku never used the Kaioken the entire battle, only when Freeza agreed for the no hands, and when he went to 50% of his maximum power.
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Okay, you're probably right, I don't exactly remember, but I'm still fairly sure that Kaio mentions that he's been using the Kaio-Ken for at least part of the battle, and that before he mentioned that, in the manga it hadn't shown Goku using the Kaio-ken. Which would indicate that as it's supposed to be used in tiny bursts, it can't normally be seen unless he sustains the burst.