The WT-9 should not have a primer bulb. If you check [link=http://wem.walbro.com/walbro/family2.asp]Walbro's Website[/link], you will see that the diagram for the [link=http://wem.walbro.com/walbro/product2.asp?Series=WT&partnum=WT%2D9%2D1]WT-9[/link] shows a primer bulb, but the parts list for the carburetor does not list a primer bulb. If you go over the parts list carefully you will see that The WT-9 has a Choke indicated by item 18 on the parts list, and the WT-9 has and High and a low speed needle which is indicated by items 49 and 50 on the parts list. Also note that Item 62 on the list is the primer bulb, and there is not part number for it.

[link=http://www.rcuniverse.com/forum/m_2371019/anchors_2371019/mpage_1/key_11mm%252Ccarb/anchor/tm.htm#2371019]11mm carb list[/link]