Question about Stihl Chain Saw Handle Models 064 066 Ms640 Ms660

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Keep burning up piston on exhaust side of 066 stihl on second jug and piston i know oil mix is right running three other stihl saws on mix

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  • jedif250 Nov 14, 2010

    could it be the after market parts

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It sounds like you are running lean. Not a lean oil/gas mix but a lean Air/fuel ratio. This engine runs hot as a high performance engine. any air leaks such as crank seals, manifold gaskets or muffler gaskets can give you too much air for the fuel coming in.

Secondly from the fuel side:
Ethanol (curse it) combines with oils that have no nondispersants making a white chalky poweder in the fuel system causing less fuel to mix with air. any blockage or pin hole leak can cause less fuel to be brought into the engine thus less cooling and lubricating.

Your carburetor and fuel filter need to be serviced and adjusted correctly or they will affect the mix.

When done the engine should run no faster than 13,000 rpm top no load speed.
This engine should idle smoothly at 2,500 with no more than 150 rpm change

if the speed is not as listed above when the rebuild is done you need to go back into the machine.

Call up a shop like www.arcolawn.comto get a EDT8 tach. it is well worth the money.

good luck

Joe

Posted on Feb 12, 2011

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Posted on Jan 02, 2017

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Rope hard to pull on Stihl 025 c chainsaw


If the saw was not running properly last time it was used:
1) What is the spark plug condition, and color
2) If the plug is grey colored:
a) remove the muffler, what is the condition of the side of the piston.
b) are there scratches on the side of the piston

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Scorched pistons in a STIHL chainsaw - and its not the fuel mixture


What side of the piston is scored? If it's the exhaust side, it's running too lean, ergo, it's the mix ratio.

Nov 16, 2011 | Stihl Chainsaw 42mm Piston Rings 025 O25...

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I bought a stihl ms 660 chainsaw used with a 32 inch bar and chain. i ran it before i bought it and was good. then i started using it maybe 5-10 minutes and it died. i tried starting it again and took...


They will score one side of the piston because of the heat.Its always on the exuast side.It could be the carb is adjusted to lean that makes it run hot.The muffler might need a good cleaning too?If it gets plugged up it will run hot too?It sounds like you gas and oil are mixed right.Thats about the only thing that will do it besides straight gas run in it.Could be the shop tec doesen't know how to adjust the carb?I would ask the to make sure its adjusted right.And not to lean.If its any kind of shop someone there should know how to do it right.When you get it back try running it wide open it should do whats called 4 stroke when not cutting wood then smoothe out while cutting.If you hold it about wide open and it runs fine.Its not right.If it does you need to open the high side of the carb a little.Maby a 1/4 turn at most.Just untill its getting to much gas to run smoothe.I hope they fix it right this time.Thats a very nice saw!

Mar 11, 2011 | Garden

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Chain saw frozen, removed cord starter the engine wont budge even with a large screwdriver in the cooling vanes, a poulan


some one ran it with out oil pull spark plug spray in some wd-40 let sit for a few days then try again if it dosent move its scrape

Feb 15, 2011 | Homelite Garden

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How do you fix as carborator for saw that has gas mixed to rich one of my employees thought it would be good to mix it 8 ounces to a gallon


First pour out all of the old mixture. Put in the right mixture. Pour an ounce or two of raw gas down the throat of the carb or inject it wit an eye dropper.(what ever works the best. The raw gasoline will run for a few seconds but will not hurt the engine. Let saw run for a while until the blue/white smoke clears. Running a saw on too much oil mixture is much better than running it on too lean as that is the way the piston is lubricated. The problem with too much oil is that the oil is sticky and clogs the exhaust ports of the 2 cycle engine, but running it on the correct mixture should correct that.

Jan 06, 2011 | Stihl Ts400 Cut Off Saw Carb Carburetor...

1 Answer

I just purchased a Stihl 041AV chainsaw and need to know what the gas to oil ratio is. Thanks.


The quick/easy answer: Use Stihl (or comparable) two-stroke engine oil at 40:1. A good name brand gas is less likely to gunk up your engine.

Background:
The old manual recommended Castrol SAE 40 mixed at 20:1 with regular gas.

All the modern Stihl chainsaw manuals recommend using 90+ octane unleaded gasoline mixed with Stihl two-stroke engine oil at a 50:1.

Since this is an older saw that runs at a lower RPM than modern saws, you probably don't want to run it quite as lean as 50:1. 40:1 is going to be about the right mix

If you want a printed manual for your chainsaw, you can request one here.

Chainsaw collectors corner has some other useful specs here.

If this answer was useful, please give it a vote! Thanks.

Jun 14, 2010 | Garden

1 Answer

I have a moccloch chainsaw, 55 cc. What kind of gas an I suppose to use?


Run lean conditions are almost always caused by an air leak that the operator failed to detect. An oil mixture of 32:1 (most older manuals) will not prevent a run lean condition. It just needlessly pollutes the air, makes for harder starting and carbons up plugs, pistons, and mufflers.

Fuel/Oil Mixture
Use a quality 2 cycle oil and mix it to the OIL suppliers recommended ratio. Today I use Stihl 2 cycle oil mixed @ 50:1 in a Pioneer that I purchased new in 1980. There are no gouges or scratches on the piston or cylinder and I have no carbon build up on the piston top. The manual (on stone tablets) recommends 24:1. Over the years the mixture has leaned from 24:1 (Saw Recommendation) to 28:1 (Lawn boy mower recommendation) to 32:1 (Oil provider 1gal premium/4oz chainsaw 2-cycle engine oil - used for many years) and finally the last 5 (±) years 50:1 (1gal premium/2.6oz Stihl 2-cycle engine oil)Any fuel containing ethanol is not good with chainsaws. Mix what you expect to use within a few weeks. Anything over 1.5 months old use up in a 4 cycle engine. HTH
Lou

Jan 21, 2010 | McCulloch 10" Electric Pole / Chain Saw

1 Answer

I need to know a fuel oil ratio.


Regardless of what the manual says once adjusted your saw will perform better with this mix.
Do you need bar oil? Available at any Hardware or Home Center.
Fuel/Oil Mixture
  1. Use a quality 2 cycle oil and mix it to the OIL suppliers recommended ratio. Today I use Stihl 2 cycle oil mixed @ 50:1 in a Pioneer that I purchased new in 1980. There are no gouges or scratches on the piston or cylinder and I have no carbon build up on the piston top. The manual (on stone tablets) recommends 24:1. Over the years the mixture has leaned from 24:1 (Saw Recommendation) to 28:1 (Lawn boy mower recommendation) to 32:1 (Oil provider 2gal premium/8oz chainsaw 2-cycle engine oil - used for many years) and finally the last 5 (±) years 50:1 (1gal premium/2.6oz Stihl 2-cycle engine oil)
  2. Any fuel containing ethanol is not good with chainsaws. Mix what you expect to use within a few weeks. Anything over 1.5 months old use up in a 4 cycle engine. HTH
Lou

Dec 27, 2009 | McCulloch 16 In 4.5 Hp Electric Chainsaw...

1 Answer

I have an old model 1975 , what miks petrol/oil is right.


Fuel/Oil Mixture
  1. Use a quality 2 cycle oil and mix it to the OIL supplier's recommended ratio. Today I use Stihl 2 cycle oil mixed @ 50:1 in a Pioneer that I purchased new in 1980. There are no gouges or scratches on the piston or cylinder and I have no carbon build up on the piston top. The manual (on stone tablets) recommends 24:1. Over the years the mixture has leaned from 24:1 (Saw Recommendation) to 28:1 (Lawn boy mower recommendation) to 32:1 (Oil provider 2gal premium/8oz chainsaw 2-cycle engine oil - used for many years) and finally the last 5 (±) years 50:1 (1gal premium/2.6oz Stihl 2-cycle engine oil)
  2. Any fuel containing ethanol is not good with chainsaws. Mix what you expect to use within a few weeks. Anything over 1.5 months old use up in a 4 cycle engine. HTH
Lou

Nov 09, 2009 | Homelite ZR10926 16" Chain Saw

2 Answers

Keeps cutting out


Your manual can be found here:
http://weborder.husqvarna.com/order_static/doc/MIPL/MIPL2008/MIPL2008_545103497.pdf
Fuel/Oil Mixture
  1. Use a quality 2 cycle oil and mix it to the OIL supplier's recommended ratio. Today I use Stihl 2 cycle oil mixed @ 50:1 in a Pioneer that I purchased new in 1980. There are no gouges or scratches on the piston or cylinder and I have no carbon build up on the piston top. The manual (on stone tablets) recommends 24:1. Over the years the mixture has leaned from 24:1 (Saw Recommendation) to 28:1 (Lawn boy mower recommendation) to 32:1 (Oil provider 8oz/2gal - used for many years) and finally the last 5 (±) years 50:1 (Stihl 2.6oz/1gal)
  2. Any fuel containing ethanol is not good with chainsaws. Mix what you expect to use within a few months. Anything over 6 months old use up in a 4 cycle engine. HTH
    Lou

Sep 27, 2009 | Garden

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