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Hi, My chainsaw started perfectly, I ran it for two minutes to check it was oiling the bar properly and then stopped it. I went a few yards to where was working and then I couldn't even pull the starting rope all the way, it was as though the engine was meeting full compression and not allowing it to turn further. I have removed the plug and the engine turns freely, I can't think what could be causing this in a 2 stroke engine- any ideas please?

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  • ade_burt Nov 20, 2009

    Thanks for your reply, I have done all done all the obvious things and yes the saw has always been used with 50:1 mixed fuel. I shall investigate the decompression valve thing further, I presume this is designed to be operated buy the starter chord mechanism, I had only briefly inspected the recoil mechanism to make sure it wasn't jammed. I tried to enter the make and model when I had posted this enquiry, but it seems that the website doesn't recognise Stihl as a manufacturer or 038 farm boss as a model.

  • jim gleason May 11, 2010

    What brand and model saw?

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Your cylinder could be loaded up with fuel. with the plug in you can not compress a liquid. if this is the problem, with the plug out you should get a spray of fuel through the plug hole when you pull over the saw. make sure the stop switch is turned off to ensure no sparks will ignite the fuel. if this is the problem, your carburator may need cleaning or your choke was on to long. also check for a plugged exhaust screen in the muffler.

Posted on Nov 21, 2009

Testimonial: "Thanks very much I can run the saw with the muffler removed so I'm going clean that out.Thanks you seem to have hit the problem."

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Did you add 2-cycle oil to the fuel you put in it?
Determine if the warranty is active first. Most warranties are effective for 1 to 5 years. If yes return it to where it was purchased or find an authorized repair facility. A written diagnosis by a good independent saw shop ($10-20) might be a good idea at this point. It is difficult to argue repair charges with an authorized repair facility without some documentation in your favor.
1. Remove the starter housing. Does the starter operate smoothly? If yes, reinstall the cover and continue with 2, if no repair starter.
2. Is the saw equipped with a decompression valve? Yes continue, no proceed with 3.
· Leave the ignition off, set the valve and pull the starter.
· Pull gently to release the valve. Is there a difference in the effort required?
· If yes continue with 3, if no repair or replace the decompression valve.
3. Was this saw perhaps operated in a lean condition (metal transfer from the piston to cylinder wall)?
· Remove the spark plug wire and plug. Remove the muffler, hold a light at the plug hole and inspect the cylinder through the exhaust port. Is it smooth and shiny or does it appear speckled with dull gray spots or smears?
· Pull the starter slowly, inspect the piston as it rises and falls. Is it a dull gray without scratches and gouges?
· Hold the light at the exhaust port and look through the spark plug hole, inspect the cylinder above the exhaust port. Is it shiny and smooth or speckled with gray spots or smears?
Any spots or smears on the cylinder or deep scratches and gouges in the piston indicate the saw was operated in a lean condition. Repair of this on a home owner quality saw often exceeds replacement cost. A repair estimate by an independent saw shop should be considered.
4. The last likely possibility is the saw has jumped timing. This problem or any not discussed is usually beyond the ability of the operator to repair. Please take it to a good local saw seller/mechanic for a written diagnosis before authorizing any repair. HTH
Lou

Posted on Nov 20, 2009

  • dontbother10
    dontbother10 Nov 20, 2009

    Most Stihl dealers are very good at what they do and sympathetic to customer problems. Have you talked to the dealer where you bought it? My Husky only gets repaired by Stihl mechanics.

    You are correct, it's difficult to post a saw as Stihl. Thanks for the rating and godd luck with your saw.

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