Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Stihl => Topic started by: tradguy on February 07, 2012, 06:47:36 pm

Title: stihl 066
Post by: tradguy on February 07, 2012, 06:47:36 pm
Have a stihl 066 that will not start,120 lbs. comp. has good spark,cleaned and put carb. kit in.It really has me stumped,gas in the cylinder isn't even getting it to try and start.Never had one do this.Was wondering if it could be a timing issue and how to check it.Any help greatly appreciated.
Title: Re: stihl 066
Post by: man of stihl on February 07, 2012, 07:05:35 pm
Do you know if the saw ran in the past with the existing coil\flywheel? Stihl made a a bunch of different combo's where the coil\flywheel have to match. Also 120 lbs is very low. It needs new rings for sure.
Title: Re: stihl 066
Post by: tradguy on February 07, 2012, 07:07:40 pm
was running,sat 2 days has not started since,fuel was changed to make sure it was not the problem.
Title: Re: stihl 066
Post by: man of stihl on February 07, 2012, 07:12:07 pm
Take the muffler off and look at the piston. You may have a stuck ring which will give you low compression.
Title: Re: stihl 066
Post by: tradguy on February 07, 2012, 07:18:39 pm
will look,thanks
Title: Re: stihl 066
Post by: tradguy on February 08, 2012, 03:04:06 pm
rings look to be fine,pulled flywheel the keyway still there,really stumped on this one
Title: Re: stihl 066
Post by: Cut4fun . on February 08, 2012, 03:31:37 pm
Just WAG here. Take the plug out and pull over and over to unflood. Put good dry plug in. Use squirt bottle like squirt oiler bottle and squirt some mix through carb into cylinder area with throttle trigger pulled. Now make sure you on/off switch is working before hand and try and start or get it to fire off.

I'm thinking maybe carb kit is installed in wrong order or fulcrum setting wrong or something to that.

I sent a 036 back out the other day with a guy with 120psi and it needs re-ringed or piston kit but it is still cutting good with a carb tuned up.
Title: Re: stihl 066
Post by: tradguy on February 08, 2012, 06:27:06 pm
thanks will try it,any place to find a diagram of carb have done a few before,could gasket on wrong side of diaphram do it? I tryed the gas in it it this morning,A matter of principal now for me....
Title: Re: stihl 066
Post by: tradguy on February 09, 2012, 05:09:53 pm
tryed all above....thanks for any input..
Title: Re: stihl 066
Post by: Al Smith on February 09, 2012, 07:27:10 pm
Well if you get the spacer gasket on the wrong side of the diaphragm it won't go fer luv ner money .You might get it to putt with a dry plug but then you'd  better keep the throttle wide open  else it will flood in a Mississippi second .

Embarrising as it is I did that to an 042 Stihl once the had me so mad I banished it to be a shelf queen .Took me two years to get over my pout .

Seriously though without seeing it I'd suspect the carb for whatever reason is the problem .If every thing is not in the correct assembley location it just plain  won't go .Obviously if it won't even fart on a prime it's flooding itself .
Title: Re: stihl 066
Post by: man of stihl on February 09, 2012, 07:44:39 pm
 if i think i am getting too much fuel. I will drain the tank and try starting it with a prime only. Then you know if it is a fuel system problem.
Title: Re: stihl 066
Post by: tradguy on February 10, 2012, 07:24:07 pm
only had excess fuel when I put fuel in with squirt bottle
Title: Re: stihl 066
Post by: tradguy on February 14, 2012, 04:46:54 pm
still not starting ,not even trying
Title: Re: stihl 066
Post by: man of stihl on February 14, 2012, 05:34:22 pm
Do you know if your guage is off? Maybe the comp is lower than the guage is reading. Also, When you say it has good spark. Is it a crisp blue spark? I've had saws with an orange\red spark and they would not fire.
Title: Re: stihl 066
Post by: Cut4fun . on February 14, 2012, 05:45:49 pm
Did you ever pull at least the  muffler or best cylinder and look for a stuck ring or rings
Title: Re: stihl 066
Post by: tradguy on February 16, 2012, 03:25:46 pm
yes all seemed good,have to say this has been a hard saw to troubleshoot. must be missing something it doesn't even try to fire with fuel in the cld. or sprayed into the carb. spark is good. 120 lbs compreesion is low but it was shut down I am told when the bar was pinched,has not ran since thanks all
Title: Re: stihl 066
Post by: rgclmc on February 17, 2012, 04:40:42 am
Try changing the spark plug. I've had plugs that looked like they had good spark but apparently not under compression.
Title: Re: stihl 066
Post by: tradguy on February 17, 2012, 01:20:11 pm
thanks tried that
Title: Re: stihl 066
Post by: Cut4fun . on February 17, 2012, 01:35:07 pm
Have you pulled the cylinder?
Title: Re: stihl 066
Post by: tradguy on February 17, 2012, 09:38:49 pm
not yet,may have too,it did not stop running was shut down
Title: Re: stihl 066
Post by: tradguy on March 11, 2012, 01:25:23 pm
thanks for the help guys,saw is running.  i hate to say all that trouble was a broken piece of the clutch spring showed all the symtons I listed..how it kept it from starting is a mystery to me,as a golf course mechanic I am at a loss how much trouble this caused