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Chainsaw has spark and fuel but still won't fire

Chainsaw has good spark and fuel but still will not fire

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2 Answers

Will fire,wont stay running.wants to be full choked,open choke,it dies


Jerry, First thing to get is a new plug gaped correctly and try. Could need carb. adjustment, fuel filter replaced, bad fuel line(cracked/pinched), Dirt/faulty diaphragm in carb. plugged spark arrester in muffler,etc.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
https://answers.yahoo.com/question/index?qid=20090528073906AA0y882
Chainsaw will only run with choke
Stihl Chainsaw starts but won run
http://tekindoor.com/miscellaneous/stihl-chainsaw-troubleshooting

May 28, 2016 | Garden

1 Answer

Having trouible restarting it. What can I do?


James, is there spark, fuel and is the choke staying on properly.
If it is trying to fire it could be a weak plug, stale fuel, dirty carburetor, or clogged exhaust screen in muffler, worn out low compression.
No spark with new plug, faulty switch, faulty coil. faulty plug wire, dirty weak magnets on flywheel.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

chainsaw troubleshooting woodland forum at permies

Chainsaw Won Start

Mar 22, 2016 | Garden

1 Answer

Why won't it start?


OUCH this is not a good sign .having improper amount of oil in mixture might have ruined the saw . they require proper compression to run . Nephew destroyed his twice in 3 months using a smokeless oil in his craftsman saw .

Sep 24, 2015 | Craftsman Garden

1 Answer

Homelite xl chainsaw won't start. I took out spark plug, put in some fuel and if fired right up. But won't run.


You need to clean out the carb. possibly replace the Needle Valve and check the Diaphram for stiffness. Also check the fuel line for cracks and rott.

Feb 10, 2013 | Homelite Garden

2 Answers

Honda GX 240 engine has spark, new carb; won't fire. what do I do?


remove the muffler and try it there is a screen inside the muffler that get carbon build up if it runs with out the muffler pry it open and clean it

May 24, 2012 | Garden

1 Answer

Husqvarna Model 51 won't start. Was running fine and has never had a problem starting (owned since new, 14+ years). Chain slipped off. Fixed and then saw wouldn't start. Good bright spark &...


If you have a good spark, and there is fuel at the plug, the only things to stop it fireing up are a sheared flywheel key knocking the timeing out, or the engine has low compression due to wear or damaged piston and ring.

Sep 07, 2011 | Garden

1 Answer

I have replaced the spark plug (even though the one I replaced tested good). I am getting spark and have added gumout for small engines to the fuel mixture and have shaken the saw to mix all three...


If there is a good spark, and it occurs in the correct place ( remove and check flywheel key ) and there is good fuel at the plug ( not excessive, this would indicate flooding, so clean and service carb ) then it should fire, if not you need to check the mechanical condition of the machine, remove the muffler and check the condition of the piston skirt through the open exhaust port, any signs of scuffing and it will need to come apart.

Aug 13, 2011 | Poulan Garden

1 Answer

The Stihl 038 super won't start. It is getting too much gas on the spark plug when I try to crank it. Just replaced the carb hoping it was that but still it won't start. The saw was working fine a...


hi there mwb15
have you made sure the ignition coil is producing enough voltage to fire under compression load ?

you may get a spark at the plug unloaded but under load it may be breaking down / weak making you think its got a fuel problem ?

does your system use a cdi coil system or point/condenser system ?
spark usually falls into weak spark, no spark catergory

if compression , fuel ( you replaced carb) and exhaust are ok , and you have air and vaccuum tight c/cases only things left are timming and spark

remember F A C T S

F = Fuel A = Air & ( air tight c/cases ) C = Compression T = Timming S = Spark

compression should be about 130- 140 approx if in good running order

take a look and let me know

cheers pauly46

Jun 18, 2011 | Garden

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