High Idle After Carb Replacement

I've inherited a MTD push lawnmower (11A-02JV006) that sat for three years. I replaced the carb with a new one and she now starts great and runs, but it runs at max speed at all times (there is no manual throttle adjustment). I replaced the throttle linkage and the throttle spring thinking I had bent/stretched them when taking the carb off initially but it still idles just as high. 
 
I'm contemplating ordering a new gasket as the rubber on the gasket is a little chewed up- but I'm not sure if this will solve the issue.
 
Is there a fuel mixture adjustment on this carb that I'm not seeing?
 
Here is the diagram of the carb: 

 
I appreciate any help/ideas on this. I'm new to small engines and am trying to save a few bucks and learn something along the way. 
 
Thanks,
Peter