I have had a ton of requests to show people how to add the throttle return spring once you have removed the governor. Without that governor, the engine will want to run wide open. You have to provide a means of returning the throttle back to idle. The video showing how to do it is below as well as the pictures showing what spring we used, where to install it, and what it looks like once installed.
This all assumes that you are using the stock linkage.