Problems with a ymf400

Hi guys, just wanted to pick your brains about something if you don’t mind. I have a ymf400 and although it’s not a grizzly it’s got me stumped. Thing started the not taking gas, kinda just fell on its face, when you tried to rev it up any at all. Figured dirty carb so took it apart and pulled the jets to check and sure enough it had a dirty jet which I cleaned and reinstalled. However, I came up with an extra spring. None of the manuals are very discript in exactly which jet this goes on. Any help you guys could give would be appreciated. Thanks in advance