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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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