I was just wondering why do most 4-strokes have two throttle cables (push-pull type throttles)? I originally thought that it was because of they had pumper carbs until I realized that the XR400 does not have a pumper carb, but still has a push-pull throttle. Having ridden ****s for 17 years, and owning a Honda 400ex, I know that these four strokes do not have push-pull throttles. Yet they have similar carbs.