Do you scaled down the Animaion?
Darth D.U.C.K has writen a tutorial about it(for BF2, but i think its almost the same for BF1)
Its at the BF2 All you need topic.

it cant be done, battlefront 1 doesnt support custom anims and that means it doesnt support custom skeletons too, sorry

Yes it can, because the Gammoreans used a custom set of unit anims and skeletons in the Jabba's Palace addons that are absent from the standard common.lvl.

HOWEVER, that said it would take lots of work to get it to work. Ask the person who got Yoda's skeleton in-game (I cannot remember who) and they might be able to help you.

ModTester wrote:

ggctuk wrote:Yes it can, because the Gammoreans used a custom set of unit anims and skeletons in the Jabba's Palace addons that are absent from the standard common.lvl.

HOWEVER, that said it would take lots of work to get it to work. Ask the person who got Yoda's skeleton in-game (I cannot remember who) and they might be able to help you.

I have also got yoda to work in game, using the ewok skeleton.

Not quite what I mean. I mean that they got Yoda's skeleton from BF2 to work in BF1 instead of just using the Ewok skeleton (which stretches Yoda's arms, legs and neck)

You'd have to ask MileHighGuy, who did the port. He has never told us how he did it.