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Will not run

My echo cs-305 just stoped running and will not start again . I have full gas tank-- 50/1 good spark --- carberator is clean and not flodding eng.-- crank seals apear to be good--- I have about 3.5 Hr. of sawing on this saw any ideas

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  • Echo Master
  • 2,239 Answers

You need to make sure it is mechanicaly ok ( not scuffed the piston ) remove the muffler and check the condition of the piston skirt through the open exhaust port, any sign of damage and the machine will need to come apart.

Posted on May 09, 2013

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Posted on Jan 02, 2017

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onescewleft
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SOURCE: Echo CS-440 Chainsaw.

unleaded fuel is notorious for going stale,and it can leave a resinous coating in the carb-try running the saw on half choke with new gas and less oil eg 50 to 1 for say ten minutes,this should clear the gunk out-if this does not work,you have two choices-strip and clean the carb,or adjust the H (high) scew on the carb anti-clockwise by a quarter turn a time till it revs out full bore-good idea to remove the chain and wear ear defenders when adjusting-and always use a chainsaw at its max rpm,or you run the risk of "kickback"

Posted on Feb 25, 2010

Testimonial: "Very good information. Not sure if the easy cure will work but at least I know where to start. Thanks "

  • 2239 Answers

SOURCE: I have an Echo CS-3450 16" Chain saw that starts

This is classic fuel starvation, it needs to run a little rich when free running, when it goes under load it needs the extra fuel to keep it going, if you have replaced the fuel filter, and the fuel hoses are good ( no leaks, or cracks in the pipe, give the pipe a tug to see if fuel squirts out ) then there is dirt in the main fuel screen under the pump diaphram, remove the carb, remove the alloy pump cover, normally held with a single screw, under here will be a gasket, and a pump diaphram, in that order, pressed into the carb is a very fine screen, this should be replaced, or at least cleaned, check the condition of the diaphram, this should be supple not hardened, rebuild and try again, the H screw on the side of the carb controls fuel to the main jet, if need be increase ( screw out ) 1/4 turn.Somewhere from the tank will be a breather, this allows air into the tank to stop a vacume occuring, to check this slacken the filer cap when the machine starts to die, if it picks up again it is a breather issue.

Posted on Jul 18, 2011

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The other day it is running fine then all of a sudden it dies and won't start. air cleaner is clean. The a couple of days later, I start it and runs fine. I'm blowing off the patio and it dies again after...


If the air filter is clean, then you have either no spark or no gas. Gummed up carberators are well familiar with the leaf blowers. Once a year or every other year you should clean up your carb. During the winter season when your not using the blower, it is a good idea to put a 1/2 bottle of Stabil in the gas tank which will prevent carb gum-up while being stored.
You can remove the spark plug, put it back on the wire, lay the bottom of the plug next to a metal surface. Then pull the motor over while you observe for a good strong spark. If you have a good strong spark, then the problem is with the fuel.
If you have no spark, weak spark, or intermittent spark, then either the coil could be bad, plug could be bad, or you may even have a shorted kill switch.
Either no gas or no spark is your problem. Spark is easiest to check. If spark is good, remove and clean your carberator out thuroughly

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Echo CS-440 Chainsaw. Was cutting firewood, saw running fine until I refilled the gas tank. The gas was a few months old but looked clean and smelled OK. But after I filled the tank could not get the...


unleaded fuel is notorious for going stale,and it can leave a resinous coating in the carb-try running the saw on half choke with new gas and less oil eg 50 to 1 for say ten minutes,this should clear the gunk out-if this does not work,you have two choices-strip and clean the carb,or adjust the H (high) scew on the carb anti-clockwise by a quarter turn a time till it revs out full bore-good idea to remove the chain and wear ear defenders when adjusting-and always use a chainsaw at its max rpm,or you run the risk of "kickback"

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Chainsaw starts fine, but dies mid cut?


Immediately after saw quits, while everything is still hot. Sometimes ignition modules quit working when hot.
Ignition Coil Test
SmallEng.com
http://www.youtube.com/watch?v=L7WNBDRG4C4
You may need to use a jumper wire between the threaded part of the plug and the cooling fins. You don’t have to bend up the electrode.

Loosen fuel cap when it starts to die, If that fixes it it has a fuel vent problem.

If you did nothing to the carburetor adjustments, are using a fresh (3 months or less) fuel mix with the same oil/fuel ratio, and are operating at the same elevation there is a reason your saw is acting up.
It sounds as though there may be a fuel delivery problem. Check the fuel filter on the free end of a hose in fuel tank (manufacturer recommends an annual replacement). Check all fuel delivery lines especially at fittings and bends for cracks and holes. If those are good then the likely cause is internal parts of the carburetor. HTH

Lou

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