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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Adjust the high speed screw on carb

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1 Answer

Have stihl ms 210 chainsaw cranks will idle boggs out when you give it gas adjust highspeed then want idle been threw carb twice its clean [ help]


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Dec 11, 2009 | RTO Spur Sprocket For Stihl 017, 021...

2 Answers

Tunning specification for a stihl 028 chainsaw?


I'm not sure there are any "endorsed" tuning specs from Stihl as weather, temperature, fuel quality etc all contribute to engine performance.
Pictures of all types are all over the web.

As for the carb tuning procedure, maybe I can help?

Start with fresh fuel, all filters clean, and bar and chain installed. Also, fill the chain oil tank with bar/chain oil and VERIFY that the chain oiler works properly.
Initial fuel mixture settings (the H and L screws) should be 1.5 - 2 complete revolutions counter clockwise from lightly seated. Sight the carb's throttle plate and adjust idle screw counter clockwise until the plate stops moving.(Throttle closed completely.) Then go back clockwise 3 complete revolutions. This will produce an acceptable startup condition on a HEALTHY saw.
Clamp the bar in a STURDY bench vise and roll the chain with the shank of a screwdriver to verify it is clear. BE SAFE!
Choke the saw and pull the starter rope until the engine "burps".
NOTE: If no burp after 6 pulls, stop! Something is wrong.
After the burp, set choke to half and pull starter until it runs. The settings I gave should produce a slightly rich condition and a slightly high idle. (Chain will be in motion!)

Blip the throttle trigger and idle it down just enough to keep it running during the tune procedure.
Step 1) Using the "L" screw (closest to the engine), turn it clockwise until the engine smooths out or possibly increases RPM. Back it out slightly until the engine has a slight "LOPE" sound to it. (Like a drag car on nitro).
Step 2) Accelerate the engine to full throttle and go to the "H" screw (closest to the air filter) and slowly turn it clockwise and note the RPM increase. There will come a point when the saw will "Top-Out" and loose power. Not even enough power to turn an maintain empty chain's RPM! Go back counter clockwise to the edge of that point, and counter clockwise another fourth (1/4) revolution.
Step 3) Idle the saw back down. Again go to the "L" screw and repeat Step 1.
Step 4) Repeat Step 2.
Step 5) Idle the saw down until the chain stops moving completely. NOTE: Don't settle for a "crawling chain" condition. If the steps above are performed well and all else is healthy, you should be able to idle the engine down to a ridiculously low RPM and it will not shut off.

Hope this helps,
Dolf-

Oct 13, 2009 | RTO Spur Sprocket For Stihl 017, 021...

2 Answers

I have a stihl 021 that doesn't want to idle, and bogs when going from low rpm to higher rpms, once on the high end it runs fine, just wondering where to start and what to look for. Thanks, Scott


This is a timing problem.
Check the plug, and check magnete.
Then if you have to, remove the carb and replace the inlet gasket.
Good luck with that Scott.

Jul 26, 2009 | RTO Spur Sprocket For Stihl 017, 021...

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