I just bought one of these ski-roules the other day. Its a 74 440 Lazer. Its my first snowmobile. Does anyone know where I can get some information/service manuals? I really need to tune the carb as its not idling all that well. Does anyone know how to do this on the Kohler 440 engine? Or actually how to tune a carb in general? Any help would be greatly appreciated. Thanks!