Question about Stihl Chain Saw Handle Models 064 066 Ms640 Ms660
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.
Posted on Feb 12, 2011
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Posted on Jan 02, 2017
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