06-12-2020, 09:33 AM
Most kart starters use a fractional horsepower belt, like GW says. A "4L" width belt is 1/2" wide X 5/16" deep in cross-section. The length of a belt is measured around the outside circumference of the belt. Thus, a 4L300 belt is 1/2" wide and 30" in length, measured around the outside as it's stretched over the pulleys. This applies ONLY to fractional HP (mower style) belts. LORD, it's been a loooong time since I remembered that bit, but it still applies to FHP inch size belts. Ted