Firstly T.

Now thats out the way.
There are many ways to drag a few more MPH out of the old girl.
1: Variator - Should achieve around 34 with this option alone
2: New tyre - Apart from thew fact that the Kenda's in the we will probably give way and see you sprawled across the road on wet days, boppers or conti-twists will add an extra 2-3 mph (Running tyres at the right PSI will get 1mph alone)
3: Airbox - Take the brick of an OEM arifilter out and fit a standalone filter to get 1-2 mph and a noise from the girl
4: CDI - This will take the limited from 6000 rpm (I think the UK ones are limited to that) up to 8500 rpm (Allowing you to add loghter weights given a better take off from standing and more rpm for more mph - 3-4 mph extra.
At the mo I am getting 40 on the flat and 44-46 on the downhill before the limiter kicks in.