If the chain runs at idle, or tries to turn when cranking the saw, then there is an issue with either the clutch drum bearing or the clutch spring has become weak, to get to both of these components you need special tools, the tool to remove the clutch is part no. 530031112, and the tool to adjust the carb screws is part no. 530035560, the L screw will adjust from idle to half throttle including acceleration, the H screw will adjust the full engine speed
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