How do I replace the starter on a Snul 125cc quad?

 

Not sure on that achine but usually pull the hot wire fro the stud and remove 2 bolts and pull it out. Most have a O ring on them so they pull out hard

 

I think it is a stretched Honda Cub clone motor, if so it will have a sprocket on the end. To fit a new starter on these, you need to remove the cover over the flywheel, once the starter is un-bolted the chain can be hooked off the old one, new one put through the mounting hole, chain hooked onto it's sprocket, and bolts re-fitted etc.