026 hard starting and bogs down while cutting

M

mcordani

Hello, I am new here and hope you can help out. I have an Stihl 026 pro that is about 8 years old that has been more and more of a pain to start. Once it starts I can warm it up but then it is tempormental. Sometimes as I cut it bogs down and I have to back off to get it to rev back up again. I've cleaned everything but touch the carburetor. I cleaned the air filter, changed the plug, checked the muffler, it has a sharp chain. I usually fix things myself but wanted to check here before messing with the carburetor. As an aside, I've never changed the gas filter but I can't ever remember getting anything in there. Also, I always stabilize my gas. Any help will be much appreciated.
 
I'm not the expert mechanic around here (or much of anywhere), but here's a couple of ideas before getting into the carb:
1) The spark arrestor screen might be clogged.
2) A fuel line might be cracked or there might be a pinhole allowing it to suck air.
3) There's also a small piece (on my 200T, at least) that is at the edge of the air filter housing. In winter, it is set one way to block an air inlet so you recirculate warm air. In the summer, it is turned around so you pull in cooler outside air. Maybe you're set on the wrong season?

I you rule these out, the real mechanics here will be able to help, I'm sure.
 
Check and replace the following as needed:

Fuel filter

Fuel line

Impulse hose

FUEL! Throw the old stuff out and get fresh 89 octane or higher

Rebuild the carb, get a carb kit from local dealer

Spark arrestor screen
 
So weird as I bought my saw new and it doesn't have a spark arrestor. I know because I tried to clean it.

I'll have to check the air filter to see if it is set wrong. I don't remember if mine has that adjustment.

I'll definitely get a new fuel filter as mine hasn't been replaced.

My fuel is brand new 89 octane with stihl synthetic oil with stabilizer so I know that is OK.

I'll definitely check on the other items but I'll start with the fuel filter. I've never gotten anything in the tank but maybe it has varnished over somewhat.

Also, what is the impulse hose? Thanks for the ideas.
 
Does anyone actually put the spark arrester back in? Isn't their intended function for preventing forest fires? It seems to me they are kinda useless in residential arboriculture.

-Tom
 
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It seems to me they are kinda useless in residential arboriculture.

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Might not of ever happen to ya, but if you get a fuel leak heahed toward it, you'll wish you'd of put one back in. A ball of fire looks pretty cool as it falls 60 foot.
 
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How would one go about taking the spark arrestor out of a ms 200

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Theres a screw holding it in just below the spark plug. It can be done with the chain brake cover on. Torx head screwdriver, and a small flathead are all that will be needed.
 
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How would one go about taking the spark arrestor out of a ms 200

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Theres a screw holding it in just below the spark plug. It can be done with the chain brake cover on. Torx head screwdriver, and a small flathead are all that will be needed.

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Yep, unscrew it, pull it out, throw it away... presto, now you have a happy, gutsy 200T... it sounds cooler too. You may need to adjust the carb a bit.
 
OK, I rebuilt the carb and the screen in it had a thick layer of gunk in it. With everything rebuilt and clean I went to start the saw and I think it badly flooded. Fuel actually came out of the compression release. After that I took the plug out and drained fuel from the cylinder. I then tried again and it flooded. This time I removed and dried the plug, and removed the air filter. It was flooded so bad some fuel came out of the carb. With everything drained I left the air filter off and plug out so it completely dries. I also turned the low idle in all the way and backed it off one turn, to reset it to factory. Hopefully it starts once it dries out...
 
Make sure the H, L, and TA are all set to factory spec. It sounds as if you are missing when the saw 'pops'. After it pops it should be set to half idle, and pulled over until it starts.

OR

One of the diaphragms are in wrong?

Let us know how you make out!
 
I'm pretty much 100% sure I put the parts all in correct. I think I just flooded it bad as I am not used to it getting gas since it was so gummed up.

Is TA the idle adjustment? I've never touched the H, but refactoried the L at one turn out. It was set at two turns out which probably helped in flooding it. Does anyone know the idle factory setting? My manual only lists the H and L reset settings (one turn out).
 
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