Small Engine Can't Reach High Idle RPM (No Load): 

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. BINDING DRIVE SYSTEM

. SPARK PLUG GAPPED WRONG

. CARBURETOR NEEDS READJUSTMENT

. CARBURETOR NEEDS TO BE CLEANED

. FUEL TANK TOO FAR FROM ENGINE OR BELOW CARBURETOR

. BAD FUEL PUMP

. RUNNING OUT OF FUEL

. FUEL LINE TOO SMALL

. BAD FUEL FILTER

. IMPROPERLY INSTALLED THROTTLE CONTROL

. THROTTLE CONTROL CABLE CLIP LOOSE

. CHOKE NOT COMPLETELY OPEN