RE: Needle Valve assembly replacement installation?
For the OS 25 FP engine you need to get OS Needle Assembly #3A212A. You can find it at Tower Hobbiies for $8.99. Here is the link to that part, [link]http://www3.towerhobbies.com/cgi-bin/WTI0095P?FVSEARCH=22281903&search=Go[/link]
Hope this helps
Ken