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My stihl ms 260 chainsaw wont idle down to low idle

I have cleaned the carb and linkages and adjusted the jets but it still idies to high

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It's most likely the clutch side crank seal.

Posted on Jan 02, 2016

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High idle is usually a sign of running too lean, or having an air leak around the carburetor mount, or even somewhere else on the machine. if turning the low mixture screw out half a turn or so doesn\'t help, I\'d start looking other places for a leak.
Check things like the plastic plate the carbie mounts to (intake manifold) and all the gaskets associated with that area.
Also, check your fuel lines aren\'t perished, they can cause air to suck up into the carbie and cause issues.
If you still have no luck it\'s possible one of the main crank seals may have gone, causing air to suck in around the crankshaft.
This is best left to a qualified small engine repairer to replace, as they can be dicky to get in there without damage.
Hope that helps!

Posted on Nov 19, 2013

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Posted on Jan 02, 2017

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SOURCE: Stihl MS 260 Pro wont run wide open or idle.

Hi brandon First change the sparkplug with the same heat range,Check and clean the gas filter with compressed air.Remove the carb and very carefully disassembly entirely.Check the gaskets and the diafragms.At the fuel pump side there is a fine screen(clean it).Check the needle,the spring and lever.Unlock the screws L and H(note how many turns are they).Put the corp of the carb in a special clean solution for 12 hours and then clean it with compressed air(something is clogged there).Put all back together and try to start the engine. regards savumihai71

Posted on Feb 12, 2009

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