Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Stihl => Topic started by: outback32 on June 12, 2014, 12:20:40 pm

Title: stihl 011av weak spark
Post by: outback32 on June 12, 2014, 12:20:40 pm
hi guys im new to this site and new to saws. my father in law just gave me a 011 av its been sitting along time. I finally got it running after I cleaned the carb changed the plug and air filter. it ran fine but the oiler wasn't oiling so I took the bar off and tried some things id read to get it to work. while I was running the saw it just died and now wont even try to start. I took the plug out to check fire and couldn't see any spark at all so I grabbed the plug and pulled again and it shocked me a little but it didn't really bite that hard. im wondering where would be a place to start to find out whats goin on with the spark thanks.
Title: Re: stihl 011av weak spark
Post by: man of stihl on June 12, 2014, 06:53:42 pm
Did you ground the sparkplug when you checked for spark? When you ground the spark correctly, it should be a nice blue spark. If its an orange spark it won't be hot enough to run.
Title: Re: stihl 011av weak spark
Post by: outback32 on June 13, 2014, 12:37:43 pm
yes I grounded the plug and when I didn't see any spark I grabbed the plug and it didn't shock that hard at all.
Title: Re: stihl 011av weak spark
Post by: outback32 on June 13, 2014, 02:25:08 pm
I just went and tried again and it is getting a good blue spark but will not even try to start. time for a carb rebuild or is there something else I could try
Title: Re: stihl 011av weak spark
Post by: man of stihl on June 13, 2014, 04:43:10 pm
Put some fuel in the cylinder. I have an oil can that I use to squirt fuel into the carb. Try that. Don't choke it when you do this. See if it runs on the fuel that you spray in there.
Title: Re: stihl 011av weak spark
Post by: Fish on June 13, 2014, 09:00:48 pm
Does it have points????
Title: Re: stihl 011av weak spark
Post by: outback32 on June 14, 2014, 05:48:30 pm
put gas in carb and same thing still wont even try I pulled the plug and it was wet and still getting spark. dried plug waited and tried again and still nothing. so im at a loss now
Title: Re: stihl 011av weak spark
Post by: brokenbudget on June 14, 2014, 07:17:32 pm
I know you changed the plug, but have you tried another one to be sure it isn't a bum plug?












teehee I said bum plug ;D
Title: Re: stihl 011av weak spark
Post by: outback32 on June 14, 2014, 09:57:31 pm
the saw is electronic I thing the plugs good it sparks nice and blue
Title: Re: stihl 011av weak spark
Post by: 660magnum on June 14, 2014, 10:42:20 pm
Might just be flooded by now. Try again tomorrow without the choke?
Title: Re: stihl 011av weak spark
Post by: brokenbudget on June 15, 2014, 08:03:26 am
I've seen more problems and frustration caused by a new spark plug than any other part on a saw. it can have the biggest, bluest spark sitting there out of the engine and have nothing while installed. this is why I don't change out a good used plug very often. why leave the EASIEST thing for last? :-\
even if it's flooded, another dry plug will give you at least a 'pop' before it gets fully drowned in excess fuel. most times.

you didn't tell us what plug you bought. not one of them 'torch' or other Chinese plugs is it? possibly an ngk?
Title: Re: stihl 011av weak spark
Post by: outback32 on June 15, 2014, 12:08:53 pm
yes its a ngk plug that's what I run in everything I have. il try another plug and see if theres any difference
Title: Re: stihl 011av weak spark
Post by: 660magnum on June 15, 2014, 12:38:53 pm
I use the NGK BPMR7A and the Bosch WSR6F interchangeably
Title: Re: stihl 011av weak spark
Post by: outback32 on June 16, 2014, 11:52:40 am
does anyone know what the compression should be on this saw
Title: Re: stihl 011av weak spark
Post by: 660magnum on June 16, 2014, 12:03:04 pm
Needs to be more than 120 lbs to consider as a every day runner.
Title: Re: stihl 011av weak spark
Post by: KilliansRedLeo on June 16, 2014, 12:10:47 pm
+1 put the gauge in the saw, ignition off, pull the saw over until the gauge will read no higher.
Title: Re: stihl 011av weak spark
Post by: outback32 on June 18, 2014, 01:13:26 pm
compression tested at 115psi is that low or ok
Title: Re: stihl 011av weak spark
Post by: KilliansRedLeo on June 18, 2014, 02:02:29 pm
Most saws need to be above 100PSI to run at all, 125-130 to run decent and above 150 to run well. Looks like a ring job is in your not too distant future.
Title: Re: stihl 011av weak spark
Post by: outback32 on June 18, 2014, 02:17:43 pm
ok but 115 the saw should still start right. so I need to start looking at other things to explain the no start. doesn't make sense got fuel got fire and no start
Title: Re: stihl 011av weak spark
Post by: KilliansRedLeo on June 18, 2014, 02:56:16 pm
At 115PSI the saw should start. Did you check to see that the muffler is not plugged up with stuff like wasp nests?
Title: Re: stihl 011av weak spark
Post by: 1manband on June 18, 2014, 08:20:42 pm
comp. = 115#  should be enough to fire or at least fart, imo.

ignition maybe questionable

old fuel was poured out and replaced with fresh mix?

spark plug wire ok?

as others have mentioned.... spark plug known to be good? or flooded with fuel mix?
---------------------------------------------------------------------------------------------


if it were me....

remove and dry the spark plug, with a propane torch. burn off wetness or water/excess oil/carbon.

you squirted fuel in the carb, but not the cylinder as 'man of stihl' first suggested.

good advice.  this should always be done first, imo.

if it farts or fires, the comp. and ignition/spark plug are much less likely suspects.

let us know what happens.


.......if it does not fire or fart, the comp or ignition or both are at fault.
 



only after it fires or farts after the first test.......


now, perform second test by squirting fuel mix into the carb.

if it did fire after this test you would know the problem lies in the carb or possibly air leaks.



its difficult (without guessing) to determine exactly what the problem is, or even eliminate
possibilities unless the first test, is performed first.


hope it helps.
-joe


Title: Re: stihl 011av weak spark
Post by: outback32 on June 19, 2014, 03:25:00 am
I haven't took the muffler off yet but I had the saw running for 2 days and it just died while I was revving it up and hasn't started since, il check the muffler and get back with ya thanks for the help
Title: update stihl 011av weak spark
Post by: outback32 on June 21, 2014, 07:07:28 pm
hey guys I pulled the muffler and checked the piston it doesn't look bad. but the small wire coming off the coil is completely bare could this be the no start problem. if it is how do you remove the coil.
Title: Re: stihl 011av weak spark
Post by: Fish on June 23, 2014, 05:06:36 pm
Can you put up a pic????  Is the trigger unit mounted on your coil leg?