On another thread some time ago, I said that my bike would jump back into 4th after really winding it on in 5th. It would only happen on a trackday, never on the road. It didnít matter how carefully I shifted to 5th, it would jump back into 4th and at around 7000 rpm or so, and that wasnít good. I got around it by short shifting in 5th and going straight to 6th, which meant losing a lot of speed.
Anyway, I was using Motul 5100 oil at the time. Prior to a trackday the other week, I changed to fully synthetic Motul 7100. The gear change problem seems to have completely disappeared. Take that how you will. Maybe the synthetic oil handles the heat better, after all, everything runs a lot hotter at a trackday including tyres.
By the way, these trackdays at Phillip Island arenít just for full-on sport bikes, you can take any road bike and ride in the appropriate group. Itís just a means of going fast without worrying about cops or other vehicles.