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Stihl 200t

paragonbuilder

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Doing a couple saws for a tree service guy. Got the 201t running good. Time to move on this 200t.
Tore it down. It's pretty dirty like the other one. I'm going to have to give him s lesson in maintenance...
Any way the piston is toast
757a34486238805643b8a942ea3d39a1.jpg

935ccca9a671c1e98ea458287b71589a.jpg
851936e8fee75f0f5523ff0563a629ce.jpg

Looks like the cylinder will clean up nicely though
8bab2da49b6c24f759e29110b0742376.jpg
db949301142f1b7f6090e0fab9a55833.jpg

This saw passed the leak down test. Fuel in it at the moment is mix gas.
Any ideas what may have caused this. By the looks of the piston top above and the plug
86fd6f945e94d064ecc846d9c107d9a2.jpg

It wasn't running lean.



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paragonbuilder

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I see alot of carbon. Looks like carbon scoring to me. Running to rich or to high a mix ratio maybe.
Hmm. I hadn't thought of that. It's possible. Take a look at the air filter I pulled off his 201t.
272fb7f2cc16063f67ae6910cdcaf899.jpg

This saw had a brand new one. Maybe he thought that would fix it???
I'm waiting for a response on the story behind it if there is one...


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TJ the Chainsaw Mechanic

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Hmm. I hadn't thought of that. It's possible. Take a look at the air filter I pulled off his 201t.
272fb7f2cc16063f67ae6910cdcaf899.jpg

This saw had a brand new one. Maybe he thought that would fix it???
I'm waiting for a response on the story behind it if there is one...


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That sure doesn't help the situation either. That would cause the saw to starve for air and fun hotter than normal. I'm surprised it ran! lol
 

paragonbuilder

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Yeah I need to teach him how to sharpen a chain too. They were really bad. I'm sure that didn't help the heat situation either. I was thinking that was the culprit... Maybe a combination of things?


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bikemike

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Hmm. I hadn't thought of that. It's possible. Take a look at the air filter I pulled off his 201t.
272fb7f2cc16063f67ae6910cdcaf899.jpg

This saw had a brand new one. Maybe he thought that would fix it???
I'm waiting for a response on the story behind it if there is one...


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That is a pre filter
 

paragonbuilder

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I'm waiting for a response on the story behind it if there is one...


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He said he bought it used and it never ran right so he put it aside. Oh well.


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bikemike

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I'd say that's old stihl oil and too rich with fuel. I have ram a few saws at 32.1 all day long and haven't had that much carbon. I bet is was dumping fuel into it to cause most of that carbon and plugged exhaust. Air filter looked good like it was doing its job
 

Al Smith

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That carbon is from unburned fuel not nessesarily from oil .If it were not for the "intellicarb device it probably wouldn't have ran it all .By the looks of that plugged air filter it was about like running with the choke on .
For those who don't know the intellicarb thing works to allow the saw to run at a reduced performance more or less alerting the operator to clean the air filter .If not the damned saw could choke out while the trimmer is in the top of a tree right in the middle of a cut .That would suck with a half life .
 

Lone Wolf

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Doing a couple saws for a tree service guy. Got the 201t running good. Time to move on this 200t.
Tore it down. It's pretty dirty like the other one. I'm going to have to give him s lesson in maintenance...
Any way the piston is toast
757a34486238805643b8a942ea3d39a1.jpg

935ccca9a671c1e98ea458287b71589a.jpg
851936e8fee75f0f5523ff0563a629ce.jpg

Looks like the cylinder will clean up nicely though
8bab2da49b6c24f759e29110b0742376.jpg
db949301142f1b7f6090e0fab9a55833.jpg

This saw passed the leak down test. Fuel in it at the moment is mix gas.
Any ideas what may have caused this. By the looks of the piston top above and the plug
86fd6f945e94d064ecc846d9c107d9a2.jpg

It wasn't running lean.



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Looks like heat, I bet the chain is dull and the fools were leaning real hard on the saw through bigger wood. Maybe cheap fuel added to the heat, does he run fresh Super or old reg crap?
 

paragonbuilder

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Hey Steve. It's good to see you here!
He said he bought it used, and realized something was wrong with it right away and put it aside. But that chain was more than dull....probably would have cut better on backwards.


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Lone Wolf

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Hey Steve. It's good to see you here!
He said he bought it used, and realized something was wrong with it right away and put it aside. But that chain was more than dull....probably would have cut better on backwards.

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Any damage to the piston guide pin and or piston where it goes due to no oil? Is there oil in the mix? Can you test the gas for high Ethanol content?
 

paragonbuilder

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Any damage to the piston guide pin and or piston where it goes due to no oil? Is there oil in the mix? Can you test the gas for high Ethanol content?
No damage. Everything is coated in a good layer of oil. It definitely had mix but I don't have anything to test it with.


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paragonbuilder

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Hey is anyone aware the screws on the Zama Carbs used on the Stihls MS 200t's are not Philips heads as you may think ? They are JIS screws and use a Japaneses screwdriver to work properly.

http://www.vesseltools.com/hand-too...se-industrial-standard/view-all-products.html
Wow! That is some cool info right there Steve! I never knew that. I always felt like my screwdriver was shot or the wrong size on them. Now I know why!!!


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