50cc - 125cc - 150cc
These belts come in different sizes defines as follows:
The fist three numbers is the length of the belt, the next two numbers is
the width, and the last two numbers is the angle (V) of the inner part of
The GY6 engine comes in two engine case lengths, a long block (measurement
form the top engine mount to the rear shock mount) and a short block. The
long block usually takes a size 842-20-30 (150cc) belt and the short block takes a
size 743-20-30 or 835-20-30 (150cc) belt. The 50cc GY6 takes a size 669-18-30.
When you click the add to cart button, you will be given the option to
select a size belt.