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So I replaced the carburetor, air and fuel filter, fuel lines, ignition coil, flywheel, carburetor gasket and clean the screen on the muffler, new gas and my Echo CS-400 chainsaw won't start plz help

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  • Reel Strong
    Reel Strong Apr 09, 2015

    Hi Love Joy, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? Have you checked to see if you have "fire" at the spark plug by removing it and connecting the plug wire and turning the engine over and see if it is developing a spark?

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Posted on Jan 02, 2017

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Terry Corrow
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SOURCE: Echo CS-400 chainsaw is it better to clean or replace the gaskets in the carburetor. .saw won't start?

replace,ethanol in the fuel eats rubber,try to use gas without ethanol

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Posted on Apr 07, 2015

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irtlmn
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SOURCE: So I replaced the carburetor, air and fuel filter, fuel lines, ignition coil, flywheel, carburetor gasket and clean the screen on the muffler, new spark plug and my Echo CS-400 chainsaw won't start

Air fuel and gas... It needs all of these

Are the crankshaft seals any good ??? This causes an air leak, leading to the engine not being able to draw in the air/fuel mixture
Check this by spraying carb cleaner into carb. Does it start ???
Did you check for spark ???
Did you set the coil gap ??? .010
Did you check compression ??? Someone mentioned 100psi. Close but most wont run under 90psi. Others need 120psi. Echo's will run under 90psi but not much lower
Did you remove the muffler and check the exhaust side of the piston ??? Scoring will keep it from running but I have seen them run, albeit poorly but still run with major scoring.
Is the spark arrestor still installed ??? Is it plugged ???

Just some of the tests I perform since I am an Echo/Shindaiwa Tech

Posted on Apr 14, 2015

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Grass trimmer running only on full choke


hello sir, my machine will only start when pumping primmer bulb or squirting fluid in the carburetor than stops. the fuel line has broken off, in most small carburetors this is a ongoing problem.old fuel will crystallize when left in tank for a long time.plugging up ports, fuel lines, small screen in carburetor.fuel lines will dissolve clogging carb.this is why it will run when the choke is on creating a vacuum to where there is fuel forced in the carb to rum,also the gas will evaporate leaving the oil behind clogging up carb.the thing to do is remove carb. and clean out,replacing gaskets or fuel line if necessary.use carb cleaner to clean out carb.make sure to make note where fuel line go.the fuel filter broke off of fuel line letting debris get in carb plugging it up.the muffler is known to clog up a lot on these machines where they want run. the compression should be 60 to 120 lbs any thing below 60 is junk. when adjusting the carb screws turn in all the way than turnout 1 1/4 turns turn in slow until machine runs also you need to check for spark by removing plug and grounding against engine to check spark, ok.a new spark plug would be a good ideal too , if you are going to make these repairs use new fuel line and filter,hope this helps,any comments welcome,thank you, !!

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1 Answer

My husqvarna 24c wont stay on and when you press the throttle, it turns off. The air filter sees clean and I cant figure out what it is.


This is probably a fuel delivery issue. You need to start at the fuel tank and work your way to the carburetor. Check condition of the tank, the fuel filter in the tank, all fuel lines (including the ones in the tank). Fuel lines crack with age and deteriorate. They lose material and it can sometimes clog the fuel filter in the fuel tank and/or the carburetor. Try and remove carburetor for an inspection/cleaning. Make sure the primer bulb isn't cracked or leaking. The same goes for the gaskets on the carburetor. A bad air leak can cause your problem also, but start with the fuel system first. A carboned up exhuast port and/or muffler can also attribute to this problem. Remove and inspect the exhaust system.That is the exhaust port of the engine and the muffler itself. If you find a spark arrestor screen behind the muffler, scrape it clean. Post back if needed.

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1 Answer

Chain saw has gas but it will not start


Remove the spark plug and test for spark at the plug--it should be blue and snappy with new or clean plug set at 0.020" gap. If weak or nothing, remove the starter side cover to expose the flywheel and the ignition module. Check the module pole gap using a thin business card for a gauge--turn the flywheel magnets under the module poles, insert the card into the gap, loosen the module mounting screws and allow the module to stick to the magnets. Re-tighten the screws, then rotate the flywheel somewhat to remove the card. Recheck for spark--if now good, ok. If still bad, replace the ignition module using the same business card as before. If the first test produced good spark, place some fuel mix in the plug hole and try to start. It should pop several times. If ok, then check the fuel filter, air filter, and muffler for plugging. Check the fuel lines for decay or other damage. Make sure the carburetor fasteners are tight. Does the primer bulb fill with fuel after several pumps? If everything seems to be ok, Then you will likely need to clean and service the carburetor. Check especially, the lower diaphragm for hardness or cracking. There is a small screen filter in the main body that can be easily plugged with old fuel. Go to: http://www.drystacked.com for a 12 page article on Walbro brand carburetor theory and troubleshooting which applies to other carburetor brands as well. Hope some of this helps!

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My homelite chain saw will only run after I prime the fuel once gas runs out engine stops running but reprime fuel the saw will run until fuel runs out any suggestions


Did you replace the fuel lines? If the filtered hose feeds the primer that is exactly what happens. Your fuel system should be similar to this.
Fuel Line Replacement
  • The hose in the tank with the filter on the free end connects directly to the carburetor input connection.
  • If the saw is equipped with a primer bulb, an output line from the carburetor connects to the suction side of the primer (once the bulb is collapsed it draws fuel from the tank through the carburetor to refill as it inflates).
  • The pressure side of the primer returns displaced fuel to the tank as it is depressed.
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HTH Lou

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1 Answer

I bought a second hand RYOBI PLT3043a line trimmer and am failing to start it.


Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression


Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

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1 Answer

After getting hot the blower will blow very hard at full throttle and then loose power and then back to full throttle after 2-3 seconds. It does not do this when it first starts off cold. I have relaced...


Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression



Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

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1 Answer

It would not crank up so i replaced the filter in the gas tank and seemed to have put it back together right


Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression


Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

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2 Answers

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then check the fuel line for cracks, and of course the in tank fuel filter are clean. If none of these help take the carb apart and see if the screen on the metering diaphragm is obstructed with dirt. These are the most common solution for your problem. On the wild side, if it dies again, remove the spark plug as soon as it happens and see if you have lost spark, some of the ignition modules have a heat sensor in them that will short and stop the spark when it gets hot, if thats the case you will need to buy a new module, Not a common broblem but I have seen it a few times, Echo is probably the best built 2 cycle on the market..

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1 Answer

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Basics to check:
1) Spark plug - brown or dark brown - OK
- aluminum or silver - piston/cylinder scored
a) is it carbon or fuel fouled
b) is there spark

2) Compression - 125 to 150 psi

3) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated

Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
5) replace gaskets/diaphragms
b) use a spray carb cleaner to clean jets, holes, and body of carb

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