Author Topic: stihl fs55 strimmer  (Read 1142 times)

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Offline joolsuk

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stihl fs55 strimmer
« on: August 07, 2018, 09:50:55 PM »
Strimmer won't start!

Spark- yes
Petrol - yes , plug wet with.petrol after pulling ...
Sprayed easy start ... kind of back fired through airfilter but no where near starting .

Have put on new carb - work ok after that .

Surely there is no timing to be done on this ?

Any help appreciated.
Jules.
1977 RD250D (mechanical restore)
1980 GS550E
1982 GPZ750R1 (mechanical restore)
1980 GSX250E (mechanical restore)
2000 Stihl FS55 Strimmer (mechanical restore) in progress

Offline mervin

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Re: stihl fs55 strimmer
« Reply #1 on: August 07, 2018, 10:13:58 PM »
  The flywheel  should be keyed on and when the magnets pass the coil it should fire. If the flywheel has come loose and sheared the key which seems very unlikely that could be your problem

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Motorcycling is not, of itself, inherently dangerous. It is, however, extremely unforgiving of inattention, ignorance, incompetence, or stupidity"

Offline betty foRD

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Re: stihl fs55 strimmer
« Reply #2 on: August 07, 2018, 10:24:27 PM »
I thought other two strokes really means bikes....
Not any other two strokes ...
Otherwise we’ll be getting, I stroked the cat twice and it bit me what should I do ?

But whilst we’re here, if you suspect the timing then maybe Newtronics have a strimmer kit you could try  :D
Rev 'em till they rattle

Offline 350lc

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Re: stihl fs55 strimmer
« Reply #3 on: August 07, 2018, 10:44:42 PM »
pump the  primer 3/5 times before starting it. try a new plug. maybe flooded
« Last Edit: August 07, 2018, 11:17:13 PM by 350lc »
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 #4 on: August 08, 2018, 07:11:38 AM »
Excellent advice all . I know it's not a bike but .... but  who else do I ask ?

It's 15 years old and has worked fine until a few years ago.
When i had to get a new carb for it. It worked ok after that .
Recently it had a no spark issue , bought magneto and it now sparks but won't start.

I'll try spark plug. The flywheel is so integrated into the engine unit but I'll check.
There is a locator on the long arm to strimmer that might not be located
correctly.

It's a nightmare to dismantle housing to get to it.
It is flooding for sure after yanking the pulley.
It spits I would say once trying to fire and blows out of exhaust and I am sure through carb.

(Exhaust muffler clean )

P.s about the cat - I find cat nuggets each morning help ....
« Last Edit: August 08, 2018, 07:13:17 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 5port

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Re: stihl fs55 strimmer
« Reply #5 on: August 08, 2018, 08:55:50 AM »
Nothing wrong with 2T Chainsaws and strimmers!  :D
Yes, the diagnostics can be tricky and agree, most agri machines are terrible to work on, like scooters!
The carburation can be grumpy and coupled with the fussy starting, it can be difficult to know what is wrong.  If I have a difficult starter, I tend to go back to fully lean, and try starts getting richer in stages.  I feel there is often a fine line with these small engines between rich enough to start and...flooded, no hope!  ???
One trick I use with start problems, is to remove the plug and pull through with throttle fully open to clear, then clean plug and heat over gas flame to burn off deposits, get it back in hot and try starting.  Often works for me.  Obviously though, starting tricks wont help if you really have another major fault. 
BTW, mates 2T Flymo had awful starting problems, needed to be turned really fast to get going and he thought compression was low.  I had a look.  The foam air filter had broken up inside and migrated into the front of the carb, mostly blocking it off.  Soon sorted with new foam and started and ran beautifully! Good luck.  :)

5port       
5port

Offline tractorman

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Re: stihl fs55 strimmer
« Reply #6 on: August 08, 2018, 09:14:04 AM »
Don't discount a broken piston ring. Easy to fix. I recently rebuilt a Stihl chainsaw for a work mate. It had seized. I bought a new pattern top end, pretty cheap too.

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #7 on: August 08, 2018, 02:04:13 PM »
All noted down..... I'll try and update.
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 #8 on: August 18, 2018, 02:00:20 PM »
This is harder than getting a bike started by miles.
Still won't start. (Stihl  :) won't start , just thought of that ...)

Plug is sparking
Fuel on spark plug when removed.

Put setting back to standard.  Tried incrementally leaning it up.
Put a spare carb I had , same.
Removed plug , pulled through a few times , heated plug , to no end.

It's as if the timing  his out? I have had this apart before
and put it back and it worked but timing I simply don't know
where that is set. As that is the case I think it has something to
Do with it.

Also off on switch . But it wouldn't spark if that was not right.

I have not tried a new plug. I suppose I will get one but
This one sparks.

So I am back to both carbs faulty (you replace these I am told
as not worth messing about with ) I have done that before .

The original issue was no spark so I got a new magneto.  It now sparks.

I should not waste anymore time on it but it is now a challenge

Why are these engines so sh*t ?

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

Offline mervin

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Re: stihl fs55 strimmer
« Reply #9 on: August 18, 2018, 02:25:03 PM »
I have had plugs that would not spark under compression on bikes before , but where sparking on the outside of the engine , so maybe worth a try 

Motorcycling is not, of itself, inherently dangerous. It is, however, extremely unforgiving of inattention, ignorance, incompetence, or stupidity"

Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #10 on: August 18, 2018, 05:15:09 PM »
I will try a plug - bpmr7a

I have sorted how one sorts the timing , all you need to do it set the flywheel and magneto gap with a
spacer , namely a business card width. That i did anyway.
So we can discount that.

Apparently these stihl's suffer from carb issues. Also as stated flooding.

- one thing i will try is max throttle, choke off and keep pulling fast to unflood the machine.
apparently opening both sides of the carb allows the air to flow through freely
(on the net it showed someone doing this)
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 #11 on: August 18, 2018, 06:58:25 PM »
Update:
New plug - still same , will not start. Sparks fine.
Petrol getting to plug

I will put back other carb (as think this one is suspect)
and that one worked ok until it stopped sparking

Then I suppose it's new carb. ) £13
« Last Edit: August 18, 2018, 07:39:38 PM 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 Numbskull

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Re: stihl fs55 strimmer
« Reply #12 on: August 19, 2018, 03:42:24 AM »
Replace the fuel lines too, if it's sucking air it will not work very well.

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

Offline tractorman

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Re: stihl fs55 strimmer
« Reply #13 on: August 19, 2018, 09:22:13 AM »
You could try fresh fuel mixed to the correct ratio. 50/1 should be correct. I had a mate with a small Stihl chainsaw that would start but not rev. I gave up trying to fix it after trying everything, including a carb repair kit. Told him to buy a new one, because its cheaper than spending money on the old one. Another thought would be crankshaft oil seals, it is a two stroke after all!

Offline Paul Dawkins

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Re: stihl fs55 strimmer
« Reply #14 on: August 19, 2018, 10:42:58 AM »
Don't discount a broken piston ring. Easy to fix. I recently rebuilt a Stihl chainsaw for a work mate. It had seized. I bought a new pattern top end, pretty cheap too.
I will remember that when mine plays up...…
Southampton