In this video I do a recommended belt change per the manual on a Genuine Roughhouse R50cc scooter. I just hit 4,000 miles and even though it drove totally fine I changed it. It's pretty easy job, you just need an 8mm socket and a 14mm socket run off an impact gun. Keep in mind setting the kickstart washer in the spline before running the nut on, you can cause damage to the splines.