If I may be so bold I think a thread for Beta related info might be a good idea as a few of us have or are thinking about them. Perhaps then some resource may build. There's short threads here, on TT and elsewhere but the info is patchy. I don't actually know what I am talking about when it comes to thumpers so I am hoping for incoming faq and ideas although perhaps collecting info here I find out as well as what others know may be a help generally. A Beta sign in thread if you may Some resources: The official website for Betamotor and for the RR 4T. The Beta RR 4T Enduro information source, tech, how-to, cross referencing...very useful. Looked after by Scud. American Beta the US importer. Beta UK , Lampkins UK importer (mostly trials bikes but enduro too). Thumpertalk, Exotics section a few threads. Of course the engines are KTM and so far it looks like they are a straight bolt in so no Beta specific issues at least in the motor department. So KTM info directly relevant. What is this thread about? These, in 400, 450 and 525 cc The RR above. The RS is the same but has road kit on installed.