Originally Posted by
Rhanfahl
As for Naruto's chakra, the reason he has so damn much was well elaborated when he first trained with Jiraiya. Naruto's seal was in such a state that he could not mold chakra properly...so Nauto being Nauto tried to compensate by making more (Remember in the first episodes when he'd use Henge and Bunshin Chakra would swirl around him like a storm!). Since Naruto spent most of his life with the seal unbalanced training like he did, he built up TONS of chakra. This is also why Jiraiya told him not to worry about getting down Chakra Precision training.