Unfortunately wiring needs to be redone by hand. That's only for the electric start, lights, speedo, and stuff. It needs bo electronics to run a 49cc engine.
Unless you have the 4 stroke, pit bike wiring off ebay or Amazon.
Only one I could have used one on was a dirtbike someone had the clutch adjustment wrong the front brake failed and the bike walked out from under me. Somehow I choked it with my hand over the carb.
You will have to wire everything yourself. They don't make wiring for the two stroke bikes. But it's not difficult if you have some sort of wiring there. Just retrace and redo.I know there are wiring diagrams online as well.
If you are looking to mod an engine like the first picture in this post. Of course if you have a 43cc youll want 49cc but this is just to show the basic mods to giving the reeded engine a lil more kick in all powerbands. Theres many-many threads about BigBore Kits and what happens if you dont...
Here is the info on mods for your piston port engine. The link will take you to it.