--> RotaxEngines-List message posted by: "Roger Lee" Hi Dick, No purge is necessary. Just unscrew the old cap screw and drop out the old spring and ball bearing and push the other 3 new parts in and secure. Takes ten minutes from start to finish including the safety wire on the cap screw. For once in our lives it really is a piece of cake. This is a highly recommended and fairly cheap upgrade. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=307182#307182 _-============================================================ _-= - The RotaxEngines-List Email Forum - _-= Use the Matronics List Features Navigator to browse _-= the many List utilities such as List Un/Subscription, _-= Archive Search & Download, 7-Day Browse, Chat, FAQ, _-= Photoshare, and much much more: _-= _-= --> http://www.matronics.com/Navigator?RotaxEngines-List _-= _-============================================================ _-= - MATRONICS WEB FORUMS - _-= Same great content also available via the Web Forums! _-= _-= --> http://forums.matronics.com _-= _-============================================================ _-= - List Contribution Web Site - _-= Thank you for your generous support! _-= -Matt Dralle, List Admin. _-= --> http://www.matronics.com/contribution _-============================================================