Cfmoto 2016 zforce 800 Drive Belt Replacement.

I used a Ultimax UA drive belt, model UA484.

 To break in a belt, use low gear (if available) while varying speeds and avoiding wide open throttle for 5 to 10 miles. If no low gear is available, vary at moderate speeds while avoiding wide open throttle for 50 miles.
Breaking in a belt is about more than a set number of miles and avoiding high engine RPM. It's about flexing the belt in the correct direction. The side faces need to wear and mate to the proper angle of the sheaves and wear into the correct friction. Cut belts are too sticky, while ground belts are too slippery when new. That wear needs to happen under low load and temperature. Belts run hotter when first installed and are more sensitive to high loads until they break in