Author Topic: stihl fs55 strimmer  (Read 1700 times)

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Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #15 on: August 19, 2018, 01:12:09 PM »
Update:

So new plug , the working when last run carb set to standard
and will not start still. Sparks and fuel getting to plug.
It will not fire at all . Spits once maybe after 1st pull then
20 more nothing.  Clean up plug , then same again.

- NOT tried new fuel
- NOT tried new fuel hoses
- just piston ring - I'll log that but that is a last resort .

I will try new fuel a d then I'll buy a carb with bits off net
But with fuel lines.

If that don't work then it's scrap but I might saw the engine in half
To see if piston ring bust.

What damned annoyingly poor engines to work on
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (mechanical restore)
1980 GSX250E (mechanical restore)
2000 Stihl FS55 Strimmer (mechanical restore) in progress

Offline yellow peril

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Re: stihl fs55 strimmer
« Reply #16 on: August 24, 2018, 03:17:04 AM »
Have you replaced the fuel filter? they may look okay but they clog up and starve the carb under load

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #17 on: August 26, 2018, 09:06:09 PM »
Next time on the strimmer I will.

Do the new fuel and check the fuel filter which seems
to be in the fuel tank.
Next contract I buy a new carb (I know they are cheap but
I refuse to ware money on this thing)

If that don't work then I give up.
I'll report ...
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (mechanical restore)
1980 GSX250E (mechanical restore)
2000 Stihl FS55 Strimmer (mechanical restore) in progress

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #18 on: October 02, 2018, 07:35:22 PM »
Got a new carb , fuel lines , plug , fuel filter ,
(Already had new solenoid thing),

Spark , compression and fuel getting through .

No start .... as before.
I simply cannot make this old stihl start ?

I can make bikes that are wrecks work but not a
Strimmer.

The only thing I can think of is the spark seems weak ?
Won't even splutter if I spray cold start.

1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (mechanical restore)
1980 GSX250E (mechanical restore)
2000 Stihl FS55 Strimmer (mechanical restore) in progress

Online stukey

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Re: stihl fs55 strimmer
« Reply #19 on: October 02, 2018, 08:31:28 PM »
they  use the same engine in the leaf blowers. We now buy them two at a time for our poo hoovers. They tend to last between 6 months and a year then completely bugger up. There are known faults on these engines but sthil do nothing about it ::) ::) ::)
Rd 350 special can we get more than 70bnp?
Silver-dust 350b now with new owner
Barnfull of shitty shit
and not forgetting the r6 streefighter
 R1Z 250

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #20 on: October 02, 2018, 10:42:17 PM »
I think as you say I am lucky almost to get
20 years of service out if it.
I so don't like being beaten though....

I want to saw it in half and never seen it again
but but but .... this challenge will have beaten me.

(One thing I will add is that the carb and bits I got
are from China- ebay)
I have put it on the garage , it has a stay of execution but
I am totally at a dead end. Countless hours wasted on this
but I'll leave it for a bit.
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (mechanical restore)
1980 GSX250E (mechanical restore)
2000 Stihl FS55 Strimmer (mechanical restore) in progress

Offline Alvin Sparklug

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Re: stihl fs55 strimmer
« Reply #21 on: October 03, 2018, 10:23:38 AM »
i have been having  problems with my 20+ year old  stihl FS108, it kept flooding, not easy to get pattern carb for this model and a new stihl carb is around£80  :o, anyway new fuel line and filter, new carb rebuild kit[think one of the gaskets was bust, new diaphram, new plug, reset the carb to base settings, it fired up a bit of tinkering with the LO and its now running like new.  :)


good luck
RD400. USA "D"


"And the Rodneys are queueing up ,god forbid."

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #22 on: October 15, 2018, 07:45:49 AM »
All noted.
I have started a restoration .... pics to follow.
A mechanical restoration as i did on my RD

- carb stripped and boiled in my lemon juice solution
(I have 3 carbs now , 2 cheap eBay Chinese ones )
Jets removed blown out with my diving cylinder
Hi / lo setting set to 1 1/4 out.
(With plastic limiters removed (as per a you tube
Suggestion from a stihl mechanic )

Muffler to be be cleaned , blow torch

Piston moves freely inside can't see any broken rings
through the exhaust port.

I am.beginning to think as it seems to be a weak spark
the coil .... the coil and ht lead.

Do I buy a eBay one for £6 or a original for £50.. ?

1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (mechanical restore)
1980 GSX250E (mechanical restore)
2000 Stihl FS55 Strimmer (mechanical restore) in progress

Offline 350lc

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Re: stihl fs55 strimmer
« Reply #23 on: October 15, 2018, 09:24:31 PM »
What about the kill switch faulty.
rd 200dx. rd 250e
 tdr 250
RD 350 LC 1981
KR1 250
gt 125 1975
gsx 750 1981

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #24 on: October 16, 2018, 03:06:39 PM »
There is an off / on only. When it is on there is a spark. (Although it never seems to look a powerful one?
but on my other engines they arent either.
I assume that means the on switch is working (That is the only test i have done)

As this has been with me for 20 years from new it has become a project.
It will run again - period - somehow. It is now as important as my RD.

I attach what the parts look like ... and the bottom left is the coil / magneto .....
thing that causes the spark. I would like to be able to test this ? I dont know how.
(I have on one occasion bought a new coil / magneto and (cheapo from china)
it sorted a similar - but not so stubborn a one as this starting issue.

The demise of the machine continued on after that until now it wont start at all.

I also attach a pic of the carb dismantled.
This is my next step - i ordered a carb rebuild kit (even though the parts look fine)
and this will arrive this week.

Status:
-Plug ok
-Spark at plug
-Muffler cleaned out
-petrol mix ok
-petrol tank cleaned out - new filter and fuel lines
-after pulling it plug is wet
-new air filter tried
-HI and LO carb setting (Two screws on the top) at 1 1/4 out on both - still wont run
-Hi setting  - gradually leaning this out to 4 1/4 turns (i was told) still wont start.

To do next:
-carb rebuild kit

Concerns:
-Is the cheapo coil i bought from china a possible issue ?
-Timing ? Is there any way that could be out ? (I cant see how) The only
change on the coil is to use a business card gap between coil and magnet on flywheel.
-Do i buy another carb ? (Again you can get cheapo from china )

Any help appreciated !


1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (mechanical restore)
1980 GSX250E (mechanical restore)
2000 Stihl FS55 Strimmer (mechanical restore) in progress

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #25 on: October 16, 2018, 03:53:57 PM »
- I will get the compression stats and report.
Hopefully can get the required spec too to compare.
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (mechanical restore)
1980 GSX250E (mechanical restore)
2000 Stihl FS55 Strimmer (mechanical restore) in progress

Offline Alvin Sparklug

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Re: stihl fs55 strimmer
« Reply #26 on: October 16, 2018, 05:12:15 PM »
i also changed out the gauze filters and fitted a new rebuild kit, think my diaphram was at fault but, like you it was flooding badly before that, once i got it running on default settings ,i ran it hard for a minute on full chat. cant get a carb for mine now or they are very rare and aboyt £80, so i feel i got off light.   dont know about the cheapo chinese part. but i tend to sterr clear if possiblle. 
RD400. USA "D"


"And the Rodneys are queueing up ,god forbid."

Offline 350lc

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Re: stihl fs55 strimmer
« Reply #27 on: October 16, 2018, 09:57:33 PM »
What about the kill switch faulty.

your right  on/off switch. maybe thats faulty. if your not getting a good strong spark maybe thats why its not running
rd 200dx. rd 250e
 tdr 250
RD 350 LC 1981
KR1 250
gt 125 1975
gsx 750 1981

Offline joolsuk

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  • Posts: 143
  • Location: Somerset
Re: stihl fs55 strimmer
« Reply #28 on: October 17, 2018, 09:52:45 AM »
Compression stats :
Dry 150lb
wet 175lb

I'll read my notes on how to assess this but I think
this is fine.

Off/on switch as I  have informed works ! There is a spark.
When off no spark when on spark !
It is very hard to seen the spark on these machines ...
There is a spark and this morning I checked and there is a
Ok spark. That would start any of my other machines.
So off / on switch is ok.

The only things j have ever changed from new is:
-Coil (cheap Chinese pattern part )
-Carb (cheap chonese pattern part )
-i also kept petrol in it when not in use. Never drained
any of my machines and never had an issue .


« Last Edit: October 17, 2018, 10:08:29 AM by joolsuk »
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (mechanical restore)
1980 GSX250E (mechanical restore)
2000 Stihl FS55 Strimmer (mechanical restore) in progress

Offline joolsuk

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  • Posts: 143
  • Location: Somerset
Re: stihl fs55 strimmer
« Reply #29 on: October 18, 2018, 05:24:24 PM »
Carb rebuild kit :
Fitted and still won't start.
There is no doubt there is a good spark.

So it's

- another carb
- perhaps fuel lines
- gaskets around carb connection.

I will order from.china.
If this doesn't fix it I will saw the thing in half and put it in the dustbin.
Life is too short for such unreliable trash .
No bike has ever caused me such issues
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (mechanical restore)
1980 GSX250E (mechanical restore)
2000 Stihl FS55 Strimmer (mechanical restore) in progress