How can I determine the factory speedo-to-odo error ratio on my motorcycle?
You can easily measure this with your SH: – Switch the SH into test mode (#1 ON, the rest: OFF) – Turn on the ignition and the RUN switch – Press the SH’s button several times until you get a high reading on your speedometer (e.g. 258 km/h), BUT avoid using the highest number that your speedo can indicate (e.g. 299km/h, 185mph, etc.) – Start a stopper watch and reset the tripmeter at the SAME time – Stop the stopper watch at a given distance on the tripmeter. For accurate calculations, let it go for at least 10.0 kms/miles. – Turn off the ignition and set the SH into normal mode (all switches in OFF position) Now, you have the following data: – Indicated speed on the speedometer – The measured distance versus time Based on these data, you can calculate the “speed by odo” value, then you can compare the speed indicated by the speedometer and the speed which drived the odometer. Formulas: Speed by odo = Distance / Time x 3600 Error ratio = [ (Indicated Speed / Speed by odo) – 1 ] x 100 S
