Author Topic: stihl fs55 strimmer  (Read 5166 times)

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Offline Alvin

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Re: stihl fs55 strimmer
« Reply #45 on: April 26, 2019, 06:25:23 PM »
i ended up getting a new carb from a stihl dealer,  and fitted it set at basic and then tweaked it till it ran. now running lovely but not cheap for an fs108 carb


http://www.anguschainsaws.co.uk/ 
RD400. USA "D"


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

Offline Astute Greaser

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Re: stihl fs55 strimmer
« Reply #46 on: April 26, 2019, 08:48:04 PM »
Hooray summer must becoming ::)
Long awaited the next installment and baited breath for end result.
My Ryobi multi tool broke a gear on its hedge trimmer. Impossible to get the bit so it now only used as strimmer.
So bought Chinese knock off of Honda multi tool for £130.00. The carb that came with it fell apart. The supplier sent me new different make carb that worked great (yes I also threw away the sparkplug and fitted Bosch). So looked up carb on fleabay.....................£4.50 including p&p. :o Bet yours is more than 10X that.
Of course that's not the right attitude or we wouldn't have RD's. ::)
Shame there is no knock offs of RD's so we can get bits. Sacrilege I hear :D :D
« Last Edit: April 26, 2019, 08:49:55 PM by Astute Greaser »

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #47 on: April 29, 2019, 09:50:36 AM »
Summer indeed will not be boring with my stihl saga.
It has sentimental value , I bought it in 2000.

When cash I will buy a genuine carb. The one thing
I have not done is buy genuine parts.
I suppose a garden machinery shop would swap out
bits until it is fixed.
That is the final option.
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (Restore)
1980 GSX250E (mechanical restore)
2002 Stihl FS55 Strimmer (mechanical restore)

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #48 on: April 30, 2019, 10:51:58 AM »
Update:

As you know the strimmer wont start. sparks ok, Petrol gets through and compression.

I looked at the switch today just before i order a genuine stihl coil (I have never used
genuine parts on fix)

I am hopeless on electrics as people may be aware of but the following i found

When switch is off (first pic) I get no or little resistance
when it is on i get max resistance (pic 2)

If i then swap the connectors round on the bottom of the switch to correct thi i get the same result ?
i.e off - i get no resistance and on i get max resistance ?

-I have never tried to run the engine with the switch off - ill have to reasemble to try that.

Q) am i right in thinking that no spark can happen if this switch (if it is working right) is off can happen ?
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (Restore)
1980 GSX250E (mechanical restore)
2002 Stihl FS55 Strimmer (mechanical restore)

Offline GAZZATT2

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Re: stihl fs55 strimmer
« Reply #49 on: April 30, 2019, 12:54:28 PM »
Bypass the switch does it start?
XSR900  350lc 400F 400f special 400F project
it did look good in a photo lance ?
Picture026" border="0

Offline mech73

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Re: stihl fs55 strimmer
« Reply #50 on: April 30, 2019, 01:42:43 PM »
I would say that switch is working correctly. It's effectively a kill switch in that in the off position it shorts the ignition out. In the on position it's open circuit.

Are you sure the timing is ok?  The flywheel would normally be keyed to fit in a specific rotational position relative the crankshaft. If the key was missing or sheared, the timing could be anywhere.

A rough check would be to check the piston is just before TDC as the flywheel trigger magnet passes the CDIbox/coil assembly.

if the trigger position isn't obvious you could locate it by attaching a strobe and spinning the motor with a battery drill 
« Last Edit: April 30, 2019, 01:56:15 PM by mech73 »
1973 RD200
Basingstoke Hampshire

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #51 on: April 30, 2019, 02:52:02 PM »
the switch I agree is ok.

the timing is so possibly it ! thibg is I have no idea how to set it.
like you say might be keyed in but where ?
years gone since I started trying to fix this ......
looking on net ....

but timing is something I am not sure is right. but it might be
set and unchangeable ?

update on rest :

original issue : would not start after a winter stood. tinkering
gradually made it harder until it stopped and will never start.
could have originally been fuel or carb .....

switch tests ok
goodspark now coil gap set
plug gap ok
50-1 New fuel
compression 150 dry / 210 wet
tried with easy start- didn't work
cleaned exhaust muffler
bought 3 New cheap eBay carbs - didn't work
bought new cheap eBay coil - didn't work

I went on dealer I bought it off 17 years ago ....
they said it is prob the carb as k have spark , compression
.... (and fuel though but might be too much )

It is booked in there now bit a 5 week waiting list.

so it's carb or timing !
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (Restore)
1980 GSX250E (mechanical restore)
2002 Stihl FS55 Strimmer (mechanical restore)

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #52 on: April 30, 2019, 02:54:12 PM »
ps I will do your timing test... but put casing back on.
hard to put on so I'll do next visit .

how to set timing on stihl fs55
on Google doesn't help me !
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (Restore)
1980 GSX250E (mechanical restore)
2002 Stihl FS55 Strimmer (mechanical restore)

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #53 on: April 30, 2019, 08:15:50 PM »
p.s they asked if I still have the original carb.
I have and they informed they would recon that
first before  buying another.

options:
I somewhere get a stihl refurb carb kit

continue to look into timing status

or / and wait for 5 week slot waiting list for workshop to do it.
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (Restore)
1980 GSX250E (mechanical restore)
2002 Stihl FS55 Strimmer (mechanical restore)

Offline mech73

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Re: stihl fs55 strimmer
« Reply #54 on: April 30, 2019, 09:09:29 PM »
I suspect the timing is fixed, unless the key has sheared or missing. The only way to adjust it would be to change the angular/rotational position of the coil and I guess that's fixed and you can only move it in and out to adjust the gap.
1973 RD200
Basingstoke Hampshire

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #55 on: May 01, 2019, 09:35:46 AM »
yes coil fixed.  two bolts. can only set the
gap on the fly wheel (which I have done) by
moving up and down and tightening the two bolts.
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (Restore)
1980 GSX250E (mechanical restore)
2002 Stihl FS55 Strimmer (mechanical restore)

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #56 on: May 05, 2019, 12:20:05 PM »
I am homing in on a possible fix. It is though this is the carb.

I have found a site that sells new stihl carbs i think :
https://www.allmowerparts.co.uk/stihl-fs55-carburettor-assembly-replaces-part-number-4140-120-0619-9867-p.asp?gclid=EAIaIQobChMIk43t3p2E4gIVLLvtCh0bXgihEAQYASABEgIJAfD_BwE

I also have it book in to the garden machinery shop on a 6 week waiting list ......

I have found the original carb that i could get a rebuild kit for but it works out not
much cheaper than a new carb.

plan:
Think i must try a new carb while awaiting the trip to the menders.
Who knows this saga could be finished before spring is over !

(Not to worry though i have a spluttering hedge trimmer as the next project)

1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (Restore)
1980 GSX250E (mechanical restore)
2002 Stihl FS55 Strimmer (mechanical restore)

Offline Numbskull

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Re: stihl fs55 strimmer
« Reply #57 on: May 06, 2019, 02:39:08 AM »
Did you ever check the crank seals? Be sure they have not blown
out of the crankcase, I have seen this happen on other yard equipment.

Rob
The lyf so short, the craft so longe to lerne.

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #58 on: May 07, 2019, 03:20:20 PM »
I have not.
I only have a quick inspection of engine and tested
compression. ( looks and tests ok )
how could I check them out of interest? (I'll find a engine diagram )
« Last Edit: May 07, 2019, 03:28:29 PM by joolsuk »
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (Restore)
1980 GSX250E (mechanical restore)
2002 Stihl FS55 Strimmer (mechanical restore)

Offline Numbskull

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Re: stihl fs55 strimmer
« Reply #59 on: May 09, 2019, 01:21:32 AM »
I have not.
I only have a quick inspection of engine and tested
compression. ( looks and tests ok )
how could I check them out of interest? (I'll find a engine diagram )

I would see if the seals have not popped out of the crankcase (visual inspection)

Remove spark plug and pull engine over slowly at first then a little faster, see if you
can feel the bottom-end compression (wont be much, but noticeable) If you feel
nothing I would think the seals or reeds are leaking.

Rob
The lyf so short, the craft so longe to lerne.