That is a tension spring for the throttle. I maintaines the throttle lever in position. This would not likely cause surging, just either too hard to move throttle or lever would not stay in position you put it. I would first look at carburetor. Mainly the load/high speed circuit. If you reach in and physically hold the throttle in one position does it start to falter? if it does look into rebuild of carb and check fuel flow from tank. If it does not run out of power when holding it in position look into setting governer. Please take the time to do a followup as to what you find.....
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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