Question about Stihl Chain Saw Handle Models 064 066 Ms640 Ms660

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Blown up stihl 064 having trouble getting replacement cylinder.Can I put a 066 cylinder kit onto this saw. Cheers Rohan

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  • retro72 Mar 16, 2011

    cheers mate all I can do is try it.Thanks Rohan



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Posted on Jan 02, 2017

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SOURCE: keep burning up piston on

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


Posted on Feb 12, 2011

  • 608 Answers

SOURCE: stihl 066 leaks gas out bottom of carb

Hi, you have a hole in the pump diaphragm in the bottom if the carby. Regards Phil.

Posted on Jul 10, 2012

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1 Answer

Is my stihl chainsaw an 066 or 064

The O66 and O64 are basically the same saw just with a different bar option. All of the parts are interchangeable. If you need parts the serial number is what you will refer to. Also taking your saw with you to the parts store is always recommended.

I’m happy to assist further over the phone at

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Will a 56mm cylinder kit fit a 064

It seems that YES a 56mm aftermarket cylinder is available for the Stihl 064. Looking at the kit you need to just replace Cylinder, Piston and rings, bearing bush and clips. Worth also replacing the base gasket too.

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Don't mess with the insides of a STIHL carb, just buy a new one. Why put new parts in an old carb?

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You are absolutely right, an 066 is a STIHL model chainsaw. Good job!

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Parts diagram

You don't get to have one, you're not a professionally trained STIHL tech.

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