Hi All, I just bought a second hand scooter, Bolwell Jolie DD50 2004 model. I have no idea what has been done to it in terms of performance mods (and I know very little about 2-strokes), but it has quite a bit of punch compared to other models I have ridden, and a top speed of around 75km/h. For some reason, when travelling between 30-40km/h the scooter seems like it wants to stall - it loses all power and splutters and coughs. If i give it some throttle it always responds, and once past 40 or so it is perfectly fine again. Any ideas what might be causing this? It is perfect at every other speed except at around 35km/h. Thanks for any help, Steve.