Can anyone help me understand the Honda part number identification, or is there I chart somewhere that shows what the numbers are? Example: I'm looking to match up an extinct part number alternate needle A685/289R from a 2000 CR250 part. I would assume it's broken down into each letter/number index.. A= ?? 685= 2.685mm straight dia. 289= taper somehow..? R= needle family (single taper / dual taper / triple taper etc.) Any help is appreciated...!