Ok Richie, Didn't know how familiar you were with mag engines ect but looking at your other posts you probably have more experience than me... I am not aware of a service manual on the net for these motors. I read a post by this guy who worked at Briggs. Spychalla Aircraft is his RCU name and was active yesterday. His homepage is, http://www.spychallaaircraft.com/ If you get any info from him let us know. I need a new ring for my 35cc and from what I can tell you have to buy a new motor to get the ring!
Tp