Small Engines (Lawn Mowers, etc.): Engine Speed Oscillating while running 25 HP B&S, carborator, code numbers

Question
During operation the engine speed increases and decreases cyclically.  When decreased a loss of power results.  The governor appears to be adjusting the carborator so that it occillates on the same cycle.  What could be the problem?  We recently also had to recharge the battery.  Could it be electrical?  Don't know where to begin...

Answer
 Hello Mark:

 1- If you Adjust the Choke, How does the Engine Run? Better or No? 2- Has the Governor Arm Been Loosened from the Shaft? 3- Send me the Make Model Type and Code Numbers Off the Engine, Please. With these I can Locate a Breakdown/IPL and Better Assist you. Thanks

 Good Luck

 Respectfully

 John