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Posted on Mar 29, 2013
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Chainsaw started backfiring then refused to start

Put in new spark plug without success

1 Answer

Andrew White

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  • Master 2,239 Answers
  • Posted on Mar 29, 2013
Andrew White
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Joined: Dec 08, 2010
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Two possibilites, either the flywheel key has sheared knocking the timing out ( remove the flywheel and check ) or the ignition unit is bad and requires replacment.

4 Related Answers

Anonymous

  • 226 Answers
  • Posted on Apr 29, 2009

SOURCE: Craftsman Chainsaw will not start

It's your ignition, which you can take that stuff apart on the left hand side of the saw under the recoil. I have 2 of these, & you can get the parts. Maybe its just the magneto gap adjustment, which is like a business card or newspaper width gap. I would check that first. Hope this helps you, Rick

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Anonymous

  • 42 Answers
  • Posted on Mar 08, 2009

SOURCE: Ryobi 18" petrol chainsaw won't start

my guess is that you have a crack or a hole in one of your fuel lines. this is very common in chainsaws and weed eaters because they are used very little and sit for a long time. try checking this and repair if necessary. let me know if this works.

jerry emmons

  • 116 Answers
  • Posted on Sep 05, 2009

SOURCE: My Stihl chainsaw starts up but then it won't stay running

Jets in chainsaw may have build-up. A good build-up remover is called SeaFoam. Add this by direction to the gas. When using the SeaFoam you need to run full throttle with intermittently full choke until motor runs smooth with no choke.

Double check 2-cycle mixture. Too lean mixture in the chainsaw wont stay running.

Anonymous

  • 2220 Answers
  • Posted on Oct 03, 2009

SOURCE: 353 husqvarna chainsaw, floods during start process

Husqvarna says the initial carburetor needle valve settings are from lightly seated 1 turn CCW for both H & L.

Your Operator's Manual can be downloaded here:
http://weborder.husqvarna.com/order_static/doc/HOUS/HOUS2004/HOUS2004_1140204-95.pdf
Once flooded Huskys are very hard to start. This works well on my 359.
Start Procedure
Cold:

  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close - sets fast idle) pull starter and listen for an attempt to start. once heard (usually two pulls)
  4. Set compression release – optional step even if saw is equipped with a compression release
  5. Push (open) choke pull starter until it starts. (usually the next pull)
Warm:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close - sets fast idle) choke, - Don’t pull with choke closed.
  4. Push (open - fast idle maintained) choke, pull starter until it starts. (usually first pull)
Hope this helps
Lou

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I have just replaced the spark plug, fuel lines,brand new carby, and new ignition module, but will not start. any thoughts. It is a Stihl FS85 BRUSHCUTTER. Thanks.

I had the same model and always had a hard time getting it to start after taking it to shop it started three times ok then the hard to start all over again. It now is in the trash as I refuse to put any more money into it. Stihl makes a great chainsaw but I would never buy another trimmer or brushcutter from them again.
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No spark

If your bike is backfiring then there must be some sort of spark as it wouldn't backfire without one. You need to check the whole starting process to see where the problem comes from.
I would check( if you haven't already) your ht leads, surpressor caps, sparks plugs and coils just to ensure 1 or more are not faulty, also check that the coils are getting charge sent to them.
Try using new spark plug instead of old ones, place in surpresor caps, 1 at a time, place against a metal surface(do not hold or touch) then try to start the bike, if there is a spark then move on two the next cap. If none of them have spark check coils are getting charge from battery, this way you can narrow it down without spending to much.
Hope any of this is useful , good luck toastie.
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Earthquake cs4518 wont start

pull the spark plug out and check it for wetness. you may have flooded it unknowingly so it won't start. if it is wet, blow it off or let it air dry. turn the saw so the spark plug hole is facing down and pull the rope a few times to clear all the excess fuel out of the cylinder. put the plug back in and with NO choke try starting it again. if the plug isn't wet let me know and we will see if we can figure something else out

If you need further help, I’m available over the phone at https://www.6ya.com/expert/kelly_69a0cf1b13789df1

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Doesn't start has spark @ plug fuel @

try starting meaning pull the rope 6 times and then check the spark plug if its wet clean it or try a new plug, if its dry your not getting fuel in the cylinder which means carb problems. if you have a seringe or something to put some gas into the spark plug hole then install spark plug and try it. if it runs for a couple of seconds then you need to focus on the carb. only put a small amount of fuel in the plug hole if you try it otherwise youll be pulling on the rope for awhile before it will start. hope this helps.
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After starting and operating the chainsaw for a short time, it dies and I can't get it started again. Suggestions?

Engines require 3 things. Spark, compression and fuel. And chainsaw need 2-cycle oil mixed with the gas.

Assuming you have the right oil-gas mixture and a fresh batch of gas, and you didn't leave old gas in the saw all summer long since last November.

-Take off the dirty air filter and see if saw starts without filter. Do not run without putting in new filter.
-Check exhaust port for mud dobber home or screen clogged with carbon and dirt
-See if saw fires up after squirting WD-40 directly into carburetor
-Check gas line >>> pull gas line loose and see if gas flows out of tank to carburetor
-Take out spark plug > put finger over spark hole and pull cord >> do you feel suction that says you got compression?
-Put spark wire back on spark plug >>> hold spark plug so threads touch bare metal part of spark plug hole >>> pull starter cord and see if spark shows between plug and saw >>> suggest you not hold metal part of spark plug while pulling cord [you'll understand why]
-If spark plug shows spark, then your saw has spark ... so put in new plug and start fresh.

If your saw has compression, spark, and fuel it should start unless carburetor is gummed up because gas was left in tank.
Here is the final trick. Start the saw while spraying WD-40 directly into carburetor and see if you can keep it going with the WD-40. This might take a helper. If this does not work, then carburetor is bad or gas line is clogged at carburetor. Time to take it to the shop.
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Make sure you have blue, snappy spark at the plug (set at 0.020"). If ok, put some fuel mix in the plug hole and try to start--it should pop several times. If pops, then check the fuel system. 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. Go to: http://www.drystacked.com for a 12 page article on Walbro brand carburetors for theory and troubleshooting. Be sure to check the placement of the gasket in the lower chamber. Hope this helps!
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Make sure the muffler has not become plugged. Check the flywheel key as it may have sheared off for some reason causing the timing to be off, yet still generate sparks. Are the sparks blue and snappy? If not, check the ignition module gap to the flywheel magnets--use a thin business card for a gauge. A wide gap can cause weak spark. Hope this gets you running again!
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If it is brand new, sounds like you should return it for the retailer to have repaired.

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

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Ryobi 18" petrol chainsaw won't start

my guess is that you have a crack or a hole in one of your fuel lines. this is very common in chainsaws and weed eaters because they are used very little and sit for a long time. try checking this and repair if necessary. let me know if this works.
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