But be very careful you don't damage the threaded post that protrudes up from the base of the CDI's wire receptical. It looks like a sheetmetal or wood screw and it must thread into the core (conductor) of the replacement wire.
Also you need to know that most wire you'll get from auto parts stores today has no metallic core. It is essentially a carbon impregnated thread. This is resistance wire or TVRS and you'll need to be diligent that the threaded post I mentioned above goes directly into the center of the core for a good electrical contact. 7mm wire seems to fit better than anything else.
Many of us suggest using a copper, or at least a metallic core wire as opposed to the resistance wire. Less resistance, more spark. It isn't as easy to find. Lawn mower or motorcycle shops are a good bet but some auto parts stores still carry it on bulk rolls and sell by the foot.
Tom