10-07-15, 08:35 PM
i can believe 10 brake difference between two of the same bike. every engine will have different materials and tolerances from new and then wildly different histories - the difference between a carefully serviced engine that's warmed up gently every time it's used with a decent mileage (run in and not worn out) and a non-serviced engine thrashed from cold regularly will be significant. Then factor in different air on the dyno on the day (hot day vs cold day or even time of day) and 10 brake difference? yes.
it's worth bearing in mind too that yamaha (no different to any other manufacturer) will select maybe 10 healthy engines from their production facility (maybe 'specially' built or re-built) and measure the output of them all and then quote the best figure from them before we even start trying to achieve that with our bikes that are at least ten years old now....
is it clean enough?