Recently my mower started running very rough. After checking the obvious (fuel filter, plug, removed plug in bottom of carb,etc) turns out it was what the manufacturer refers to as the pto switch (blade engage switch). After replacing the switch, the mower only runs at one speed which is about 3/4 speed. Won't rev faster or slower. The throttle cable is moving but not engaging the carb. I can't find a pic or diagram of what the throttle linkage should look like. Any help would be appreciated. '21 year model.