I have a taotao 125cc atv, I can not get any spark. I have replaced the regulator, solenoid, the cdi box and still do not get spark. The engine cranks but will not fire. Please help.

 

Find your multimeter and check voltage from stator.
It's the easiest way to find a problem, if there's no voltage from the stator then the stator is bad, and if there is voltage just continue down the line to find either a broken wire/or a defektive item.

 

Good place to check as well is the back of your key.. I had issues getting another one started the wires looked good from far, but when i actually pulled it out and looked one of the leads was only being held by 1 strand of wire