Moin Men, have changed my 2004 RK against a 2006 RK. The 2004er had 17500km on it. Have rebuilt all parts. I am satisfied with the 2006er. Wouldn’t like 6speed. I also accelerated on the train with the 2007. ( next to each other ) and also driven itself. No difference despite more ccm and about 6 Ps more. And the control of the exhaust (engine managant) also does not like. Have changed an open air filter and the software,so Stage one the part goes to the 190 km that is enough we It’s a bit out of date.