Naruto has lots, if not just about the same as kyubii to keep it supressed.
Originally Posted by sakura_hana
Against gaara he used only HIS chakra to summon, 2000 clones. (but he did use the kyubi for gamabunta)
The kyubi chakra wasn't "split" but rather separated.
Oh and another thing....does Naruto only having half of the Kyuubi's chakra mean that when Naruto is in (4 tail kyuubi mode) its actually equivalent to only 2 of the real Kyuubi's power?
So if you set aside the same ammount from the real , and compare with naruto's they would be the same. so no, naruto can't get a stronger 4 tails having acess to full kyubi chakra..
I also have my doubts that he can go over 4 tails at all, withou removing the seal.
"Chile is a thin and tall country"