Carb adjustment on model 287707 type 0153-01 code 9303174A?

I have an old montgomery wards signature series....briggs and stratton motor model 287707 Type 0153-01 code 9303174A. Its idling EXTREMELY high even when its throttled down. I cant seem to find how to adjust the carb. My lawn mower repair guy didnt know either. Any Help greatly appreciated.