Question about RTO Spur Sprocket For Stihl 017, 021 Chainsaws

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Stihl 021 will start, idle, and throttle up, but blade does not move

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  • josh1111 May 11, 2010

    inspect the chain teeth( not blades) for burrs. is the bar getting oil? is the saftey brake on or sticking?

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Release the chain brake

Posted on Apr 22, 2009

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Which is more reliable..a stihl 017 or a stihl 021 ? looking to bid both in good runnung shape...thanks


Hi, you cant go wrong their both stihls. The 021 is a more powerful saw and the 017 is lighter, so it all depends on your intended use. Regards Phil.

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Stil 021 chain saw. It starts easy, but when throttling up, the cain bar will not move. I have disasmbled the covers and am able to move the sprocket with a pair of pliers. How do you remove the...


This sounds like you may have the chain brake stuck on. The hand guard is also a chain brake. release the chain brake by pulling backwards on the handle. If this does not fix the issue remove the clutch by pulling the c-clip and retaining washer. I would look at the bar and chain and make sure they are not bent or damaged. ask a local dealer like www.arcolawn.com for parts or tools you may need. Good luck barterjoe_12.png

Nov 01, 2010 | RTO Spur Sprocket For Stihl 017, 021...

1 Answer

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


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!

Jul 17, 2010 | 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...

2 Answers

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.


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.

Feb 28, 2009 | RTO Spur Sprocket For Stihl 017, 021...

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