Question about RTO Spur Sprocket For Stihl 017, 021 Chainsaws

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Eng runs but rpm go up and down 1000rpm to 3000

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Remove the carburetor and check the diaphragm in the lower chamber for loss of flexibility, holes, or cracking. Check the components behind the carburetor for cracking or other damage--air leaks here can cause erratic idle, and could cause cylinder/piston damage if allowed to continue. Make sure the throttle trigger has positive control of the carburetor throttle arm and the return spring is intact. Hope this helps!

Posted on Jul 18, 2010

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Posted on Jan 02, 2017

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