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View Full Version : STihl fs-85 pro problem


K c m
06-29-2006, 03:41 PM
First off my trimmer is 5 and a half yrs old with no new parts (keep in mind) The trimmer was running great for the first part of the season but for the last 3 weeks it has been running fine for about 15-20 min and shutting down. Try to restart it and nothing. Next property it starts right up and runs fine agian for about 15 minutes.

First off i thought it was a faulty connection with the sparkplug wire and the sparkplug. So i cut the old end and stripped it and put the coil back in and put it back in its housing. (still doing the same thing)

So i took off the whole unit magnets and all (since its one unit) and figured maybe they needed to be cleaned off. ( same thing)

Im kinda at witts end right now since i have a stupid home owners as a backup. IM hoping its not a big issue maybe just needs a replacement wire magnet and coil housing for the sparkplug. Im hoping thats just it tho :confused:

any help would be great. I need any comments as soon as possible please. ALl this rain and now its hot and humid GRRRRRRRRRRRRRRr.

thanks in advance
rob KCM landscaping.

MowerMedic77
06-29-2006, 03:54 PM
Make sure your tank is venting properly and your fuel lines are not dry and cracked. After checking these things, do you have an inline spark tester? When it shuts down test the unit for spark I have changed lots of ignition coils on Stihl handheld.

sgtgm5
06-29-2006, 06:36 PM
HI,
Sounds like it is your ignition module. I just had the same proplem with my fs 85 and is almost as old. I got the part for 32.00.
It is the module that your spark plug is hook onto. It heats up and breaks contact not alowing spark to transfer after a period of time and then cools down allowing spark.. Let me know how it goes.

K c m
06-29-2006, 07:14 PM
HI,
Sounds like it is your ignition module. I just had the same proplem with my fs 85 and is almost as old. I got the part for 32.00.
It is the module that your spark plug is hook onto. It heats up and breaks contact not alowing spark to transfer after a period of time and then cools down allowing spark.. Let me know how it goes.


thanks a lot guys. Ya im banking thats the problem. It produces electricity from the rotating magnets.

but ya when i have some time ill snag one. That trimmer is a beast :weightlifter:

sgtgm5
06-29-2006, 07:21 PM
Yep,
I love the fs 85. I did have a problem before fixing it about why dont i just bye a new fs 100. I really needed a trimmer that could use the attachments cause i have a big hedge job coming up. The 100 also can use the attachments. Im glad now that i fixed the old one. Now i have that fixed and a echo 2601. LIke both but sthil is top of the food chain when it comes to weedwhackers. I will soon bye a fs 100 when i decide what type of trimmer rack to bye. Good luck for the rest of the season and hope you dont have to put no more money into it.

K c m
06-29-2006, 07:36 PM
SG. let me ask you something. I took a look at the one i have and when i reinstalled it after cleaning it i wasn't sure how close to the magnets to get. How close did you install the thing? cause u can get a good 8th off the magnets it if u want or as close as a mm. ??? what did u do or does it matter?

ed2hess
06-29-2006, 08:54 PM
Use a paper tab card to adjust...needs to be pretty close. Maybe the width is .007"....never worried just used the container that spark plugs comes in the set the gap on between the coil and magnets.

lawnboy dan
06-29-2006, 08:59 PM
coils have gone bad on every one of my sthil edgers and weedeaters. one went out on my extended hedge trimmers too. - i dont buy sthil products any more. the coils shoild have a lifetime waranttey but dont! sthil stuff has gone to crap!

6'7 330
06-29-2006, 09:04 PM
Ignition coil is a good bet.There is a 5 year parts and labor warranty on that module.

lawnboy dan
06-30-2006, 08:29 AM
it should be lifetime like echo has! 5 yrs isnt long enough. the ones that failed on me were all over 5 yrs old as most of my sthil stuff was back ups .

K c m
06-30-2006, 03:30 PM
it should be lifetime like echo has! 5 yrs isnt long enough. the ones that failed on me were all over 5 yrs old as most of my sthil stuff was back ups .

the power is worth buying one every 5 years though.

Thanks a lot guys. hes fixed.

sgtgm5
06-30-2006, 05:03 PM
Hello all,
Are you kidding me. Echo has a lifeime warrenty on their parts. Well if thats the case which im going to investiagate tommorrow, i might consider Echo products for now on. Is there a catch. Do you have to be original owner. Do you need reciept. Would like to hear back, Thanks.

ed2hess
06-30-2006, 05:06 PM
Hello all,
Are you kidding me. Echo has a lifeime warrenty on their parts. Well if thats the case which im going to investiagate tommorrow, i might consider Echo products for now on. Is there a catch. Do you have to be original owner. Do you need reciept. Would like to hear back, Thanks.
No life time on most of the parts.....only a select few. And in the case of the life time coil you must pay for shop to put it on..or at least that is how it is in our area. I think they still have lifetime on the spring shaft and those are only two parts.

twj721
07-01-2006, 11:19 AM
My FS 85 was doing the same thing took it to local dealer and he checked it out and could not make it do it again told me he had one that the switch was loose on the inside or something like that and the vibrations would make the switch go closed . Told him that we could fix this problem real easy he needed to keep my old weeeater and work it and try to get it to do it again but in the meantime go back there and bring me a new one so I sloved the problem and got a new toy this one I got is a FS 80 with handle bars LOVE IT !!!!! even got a deluxe harness to go with it .

lawnboy dan
07-01-2006, 08:58 PM
still another desighn flaw with sthil products is that cheap plastic switch. i finally got fed up and disconnected them and choke them to turn them off. the throttle triggers sticking all the time is also another bad desighn. here in fla cause of the heat guys sweat and it runs down their arm and shorts the cheap plastic switch out and the machine dies. bad desighn