To be honest Central is the biggest. If they don't have it its likely not anywhere else.

Try local hobby shops as they will sometimes get parts in. But there are slim pickens there as its just so hard to keep parts like that in stock. There are too many to choose from.

I'm sure there other comapanies that have YS parts try the OMP or Hobby Barn they carry YS engines and might have some parts.

Also Horizon Hobby is a distributor of YS engines and they carry parts too.

Troy Newman
Team YS