You can if you set up the account to bill to a credit card.

I had an account when I was in Japan, but cancelled it after moving here to the US. There is a monthly fee involved with Yahoo Japan even if you dont use your account.

And if you ever get on there and start using it, here is a tip: dont even try to snipe with last-minute bids like on Ebay. The default bidding function on Yahoo Japan Auctions will tag on an extra 5 minutes if you bid any time within the last 5 minutes. In other words, the auction truly does not stop untill the bidding has stopped for more than 5 minutes. I have seen some go hours past their original "end date/time". Some auctions dont have this, but the seller has to choose that option when they set it up.

And no, most of the sellers will not deal internationally. It would be like asking someone from the US to learn Japanese just so they could speak to you.
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Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
MY BIKE PICS