Small Engines (Lawn Mowers, etc.): slow idle lawnmower, carburetor linkage, briggs and stratton

Question
QUESTION: I have a Murray select 20" lawnmower with a 4.5 hp briggs and stratton engine.It wouldn't start so I took it apart to clean out the old gas and the carb.When re-assembled it will start but idles too slow.There is a spring loaded white plastic triangular piece on top of the carb.It has a linkage bar attached to it at one end but I can't see the other end.The plastic piece seems to sit at either 3 or 12 o'clock.at 3 it idles slow at 12 it races too fast.Any suggestions on what to do?
Thanks, Rick

ANSWER: One end of the carburetor linkage should connect to the hole in the white airvane governor lever and the other end connects to the carburetor butterfly shaft.
Let me know if this helps.
Eric

---------- FOLLOW-UP ----------

QUESTION: Thanks for your reply,both ends of the linkage appear to be connected corectly but the idle is either too slow or too fast,is there an adjustment for the idle speed?

Answer
Were you having trouble with an Intek engine?
Eric