Chris Ellis

I have a Roadsport, 140 bhp, 2004 SV. On a trip back from Oulton Park today for the Gold Cup it dropped out of 2nd and 3rd when accelerating hard. I am pretty sure I didn't touch the clutch pedal early, it just flew out of gear a moment before I wanted to change up, perhaps at about 5000 revs. No apparent damage, just pulled it into the next gear and carried on, but if it is dropping out by itself under load then it will do some damage eventually. Any suggestions please?