The KFX90 has a throttle-limiting screw located on the throttle housing that allows parents to control throttle opening to help new riders gain experience at slower speeds; continuously variable transmission (CVT) eliminates shifting to simplify operation; electric starter with interlock easy push-button starting, full floorboards, single A-arm front suspension with twin shock absorbers, single-shock rear suspension system; 1.5 gallon fuel tank capacity.