Author Topic: 026 Pro Down  (Read 786 times)

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Offline wfopete

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026 Pro Down
« on: April 21, 2014, 08:36:13 am »
My 15+ year, lightly used 026 Pro Stihl has been a reliable, trouble-free saw until last week. I try to fed it good stuff but has seen some ethanol fuel at times. Last week I was cutting with it and it was running fine. The next day it wouldn't hold it's RPMs after a couple of seconds at wide open throttle. I pulled the carburetor and checked the screen and the bottom of the carburetor, everything with the carburetor looked clean. I reassemble the 026 but it still had the problem. I even fed it some Sthil premix in a can fuel. So I pulled the fuel filter and fired it up. Ran great, made four full cuts though 14" logs without a problem. I thought; "Great it needs a fuel filter!" and ran off to my dealer and came back with a new weighted Sthil fuel filter. With the new filter in place I fired up the saw and...it wouldn't rev; maybe even worst than before. I pulled the filter and it still would not rev at wide open throttle. Then it stalled and wouldn't re-start. Has great spark but I have the feeling the saw isn't getting fuel to the carburetor. Fuel line is solid (not collapsed). My dealer is booked with work for 2 weeks so I'm trying to fix this 026 myself. Any suggestions???

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Offline 660magnum

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Re: 026 Pro Down
« Reply #1 on: April 21, 2014, 09:01:54 am »
Sounds as though your fuel line has a air leak crack in it.
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Offline KilliansRedLeo

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Re: 026 Pro Down
« Reply #2 on: April 21, 2014, 10:26:33 am »
I'll go along with that! Have you plled the muffler to have a look at the piston and cylinder?
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Offline wfopete

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Re: 026 Pro Down
« Reply #3 on: April 21, 2014, 12:17:31 pm »
No, but I will!

Offline brettl

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Re: 026 Pro Down
« Reply #4 on: April 21, 2014, 04:59:41 pm »
Change the plug if you already haven't, just to eliminate an easy variable. Wouldn't hurt to put a new carb kit in if you haven't already. Those pumps can look good but give inconsistent results if they're beginning to harden. Cheap tune-up, even if it doesn't fix your problem you've at least eliminated that variable. I had a 026 Pro but some azzhole stole it so it's been a while since I've looked at one, does the air filter have a plastic choke stopper? If so, and if the spring is starting to weaken, the vacuum created by the carb can pull it almost shut or shut causing all sorts of mind-boggling issues. Wait until the next time it acts up, take the filter off, and run it in clean, open air and see if it changes anything.
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Offline wfopete

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Re: 026 Pro Down
« Reply #5 on: April 21, 2014, 06:55:27 pm »
Thanks.  I should be able to play with it tomorrow and report back!

Offline tinkerswithengines

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Re: 026 Pro Down
« Reply #6 on: April 22, 2014, 07:25:17 pm »
Have you checked the impulse line for damage.
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Offline wfopete

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Re: 026 Pro Down
« Reply #7 on: April 22, 2014, 08:32:22 pm »
Keep in mind your are talking to an noob when it comes to chain saws.  I replaced the fuel tank line today.  I didn't detect any failure of the old line. Went to remove the muffler so I could peek at the piston/cylinder.  Took out the two bottom #25 torx bolts but I don't see how to access the nuts/bolts that secure the muffler to the exhaust port area, unless you are supposed to separate the muffler at the seam. 

Impulse line?  Is that the little line that connects the carburetor to the engine (crankcase)?

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Re: 026 Pro Down
« Reply #8 on: April 22, 2014, 09:14:02 pm »
Keep in mind your are talking to an noob when it comes to chain saws.  I replaced the fuel tank line today. 

Impulse line?  Is that the little line that connects the carburetor to the engine (crankcase)?

YES.    That line is what makes the carburetor draw fuel.
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Offline Nathaniel Vansickle

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Re: 026 Pro Down
« Reply #9 on: April 23, 2014, 09:51:52 am »
Keep in mind your are talking to an noob when it comes to chain saws.  I replaced the fuel tank line today.  I didn't detect any failure of the old line. Went to remove the muffler so I could peek at the piston/cylinder.  Took out the two bottom #25 torx bolts but I don't see how to access the nuts/bolts that secure the muffler to the exhaust port area, unless you are supposed to separate the muffler at the seam. 

Impulse line?  Is that the little line that connects the carburetor to the engine (crankcase)?

Remove the 4 torx screws on the muffler and pull the front half off that will give you access to the 2 screws that hold the muffler onto the cylinder.
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