Guild Wars 2

Hello!!

The precursor weapons can be account and character binded before craft the legendary weapon?

Account- and soul-bound does not affect the ability to drop an item into the Mystic Forge, so binding the item to you account or to a character shouldn’t matter.

Although, I can’t say I’ve tested that. Storm sat in my bank until I finished everything else (back then, the skin was the same as Tsunami, and wasn’t very impressive).

Yes, you can equip your precursor weapon and still use it to make your legendary (I’ve done it a few times). Since it will be soul bound to whichever character you use it on, they will have to be the one to forge the legendary.