I'm not sure how GP's switch works. I have a plain old toggle switch on mine. Here's a tip for ya- The "Zenoah" toggle switches Horizon sells can be had at Autozone for several dollars less. I have two 38s myself. The newer prop hub version has a carb with a choke. The older prop hub version's carb has no choke. I picked up a couple of choke carbs off of fleabay.