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How to test decompression valve stihl chainsaw

What is a faulty decompression valve ,how is it faulty,

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  • 13 Answers

Sounds like a valve that releases some or all of the compression during starting, to make ripping the cord easier. When the engine fires it is supposed to close automatically & allow the engine to start. They can become faulty mechanically (broken spring) or they can become clogged with combustion junk, esp if run the oil too rich. This will make starting difficult or impossible. Best fix is to replace with new or re-manufactured if you can get.

Posted on Apr 01, 2014

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Posted on Jan 02, 2017

  • 82 Answers

SOURCE: where is the spark plug located in a stihl 026

Hi,
It is in the circled location on the image below

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This came from the manual located at http://www.stihlusa.com/stihl_ownersmanuals/026_Manual.pdf

If this helps please leave feedback


Posted on Feb 04, 2010

Dolfoff
  • 148 Answers

SOURCE: 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-

Posted on Oct 13, 2009

  • 2692 Answers

SOURCE: 0340 AV stihl chainsaw won't fire

Spray a little starter fluid down the carburator . It is starts then is is a fuel problem. Most likely a gummed up carburator. Remove and clean . 

Posted on Jan 24, 2009

SOURCE: stihl 009 chainsaw

http://www.ultimatehandyman.co.uk/manuals/stihl/19.pdf
manual above it is all in there..

Posted on Mar 26, 2010

  • 1 Answer

SOURCE: how to find date of manufacture for stihl chainsaw

call up Stihl USA and ask them when your saw was manufactured. Tell them you bought it used and give them the serial. They told me!

Posted on May 11, 2010

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Brian, check valves for proper adjustment, if they are OK then problem could be decompression cam/valve faulty. Check the attached links,instruction and guides, Good luck
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1 Answer

Put new decompression valve in , when pulling the pullcord there's no compression ,it justs jams


Check to make sure the old valve didn't have part of it fall down on top of the piston. I just had that exact thing happen to a TS400 in my shop for service.

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I have an xr250r 1996 but wen i kick start it thers no compression but can run start it sweet and theres heaps of compression how can i fix this problem


First , check your compression with a compression tester. It should be at least 100 pounds pressure just to run. Preferably 120,130,140,etc.. Some motorcycles have a decompression cable that works off the kick lever, others have a decompression lever you hand operate. I believe yours is hand operated . I think the actual lever in the valve cover on top of the motor is sticking or the decompression cable itself is hanging up and not allowing the exhaust valve to close properly.

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