I've recently bought a SYM Fiddle II 50 and love the looks, the handling, but GOD is it SLOW!! I got it supposedly not restricted, but cannot get more than 55kph out of it, even downhill in a hurricane. I've ordered a performance CDI, still waiting. Outside that is there anything else I can do to get the acceleration up to par? On an incline I can hardly get over 30 kph which is a dangerously low speed where I live.
I know what you mean! I rode a restricted Fiddle II 50 not too long ago and it was WAY slow also.
The first thing I would recommend is for you or someone else to take out the restrictive washer between the variator plates. This washer keeps the variator from closing all the way, keeping the drive belt from going to the outer limits on the front pulley, which reduces top-end speed. Below is a short, basic video from YouTube on what needs to be done:
If you are not comfortable doing this yourself, most any reputable scooter shop can do it for you in a matter of minutes. Try this particular derestiction first and see what performance improvements you notice. From there, there are all sorts of performance enhancements you can make, depending on how much you want to spend to remove the restrictions. I believe your Fiddle 50 is restricted about 4 different ways directly from the factory, which includes the variator restriction, carborator restriction, exhaust restriction and CDI restriction.
Let us know what you do and the results.