Although I need to look in more detail at the data for the 3 ‘judder’ runs (nothing particularly jumps out at me), I wondered if you noticed - i.e. could hear or feel - the engine speed cycling during the 10 seconds or so spent in 4th gear during the light throttle run?

Thank you so much for your replies guys.

In answer to if I could sense anything on the light throttle run, not that I recall. However, I have noticed the revs doing what I would call "hunting" at some stages.

In the 3 throttle runs I did feel anything wrong. On the judder runs, the judder was very apparent, as in my 80 year old mother would have noticed something wrong.

Thanks again for the help, really appreciate it

Very strange. Considering the judder is so apparent, you would really expect to be able to see it in your three ‘judder’ runs, but it just isn’t there. You generally see a 1Hz oscillation of around +/-100 rpm in engine speed (like we saw in Gsxr1250dave’s traces).

On the other hand, you can clearly see an engine speed oscillation in 4th gear during both the light and the medium throttle acceleration runs, yet it isn’t noticeable to the driver.





Phil