Author Topic: stihl fs55 strimmer  (Read 153 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)

Online 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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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 »
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Offline twostrokelooney

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Re: stihl fs55 strimmer
« Reply #4 on: August 08, 2018, 06:53:57 AM »
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

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Offline joolsuk

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Re: stihl fs55 strimmer
« Reply #5 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)

Offline 5port

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Re: stihl fs55 strimmer
« Reply #6 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.  :)

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5port

Online tractorman

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Re: stihl fs55 strimmer
« Reply #7 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 #8 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)