I have the need to adjust the carb on my B112. When I start all is fine and it starts great and idles fine. After I mow for a while it will not idle down. It keeps running at about the same rpm I was using when mowing. It also seems to smell like gas if I unload the engine- like going down hill. Is there a quick link someone can provide for these adjustments? My owners manual does not have a section on the carb.