I was told one day that after installing Carburetor Keihin FCR 41 MX to my 640 Adventure 2005 would be good as well to install ECU unit taken from KTM 625 model, which originally is equipped with Keihin FCR41MX and ECU provide slightly different Ignition Curve what can give you even better performance than carburetor swap only . They are many ECU units available for KTM 625 SMC road models and KTM 625 SXC enduro off road models . Is it a big difference in Ignition Curve and performance between ECU from KTM 625 SMC vs KTM 625 SXC ? I have got a feeling that ECU from SXC Enduro could be better for my off-road riding , but maybe there is somebody in the Forum with experience in that matter ? Which one is better to choose ? ( any part number , please ? ) Is there really a difference after swapping ECU from Adventure model to ECU taken from KTM 625 ? Is it any danger for the Engine if I will still use ECU form my Adventure model after replacing my carburetor from Mikuni BST40 to Keihin FCR41MX ?