Question about RTO Spur Sprocket For Stihl 017, 021 Chainsaws

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I have a stihl 021 chainsaw that will crank and idle fine however it will not throttle up to full speed ,it will accelerate to about half, then it just like chokes out.

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  • John McKinney May 11, 2010

    my best guess would be that you have a damaged or broken throttle cable. check this out and let me know if this is the problem. it is pretty common on most chain saws. I can also suggest a great place to get parts if this is the case. Let me know.

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Try cleaning air filter and re tuning saw as well

Posted on Apr 25, 2013

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For the 021...on the muffler, there is a spark arresting screen, this is to prevent sparks from coming out of the muffler. It is common for this screen to become clogged with carbon from the engine. You will need to clean/replace this screen in order for it to run correctly.

Posted on Apr 21, 2009

  • COUGHY_MAN Apr 21, 2009

    You will need to clean/replace the spark arresting screen on the muffler.

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