2002 honda 400ex

hello guys i just got a like really good shape 2002 honda400ex picked it up for a pretty good price
so anyways i was has very happy till i rode it
i can not get it to do a wheelie in any gear
its has 15tooth on front and 38 sprocket on back it has 22x11x9 tires on the back
this Honda is stock just a k/n air filter on it
when i am going down the road it is very fast it really runs good ay all speeds
but for power i would not drive it around my friends its got not much bottom end
i was thinking of getting a 14 front sprocket for it first and see what happens
i have seen a site where they are modding the stock muffler i might do that right not its real quiet
i really like Honda but you think it would have enof power to pull the wheels off the ground in first gear