125cc

So i'm a little confused about wiring up a headlight on my 1973 trail 70 after getting a Lifan 125cc engine. Theres a yellow wire coming out of the engine, which from my understanding is an active power wire. My question is, would I be able to hook the headlight up to this wire to power it, or...

So I did it, I threw my hat into the ring on YouTube. I'm doing a series of videos on this 125 build .Check it out and like and subscribe if you have some time .It's my 1st time doing something like this. I'm also on Instagram Sketchy_Bikes of you want to give me a follow! Thanks, Luke

hey i lost my key for my ct70 but i am puttin the lifan 125 engine on and was wondering if the engine will start or will i neeed 2 get a new ignition or any thing like than thanks please answer need help a.s.a.p