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Old 02-15-2014, 09:30 PM
sr73087 sr73087 is offline
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Location: PA
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Stihl FS 55 R Wont Run With Choke Off While Cold

I was messing around in the garage today and went to start my FS 55. It started after several pulls and I ran it with the choke closed for a good minute but as soon as i opened it up, it died. I am not sure if this is something to be concerned about or simply it is jetted too lean to run with temps in the 30s.
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Old 02-15-2014, 10:29 PM
themadcutter themadcutter is offline
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Quote:
Originally Posted by sr73087 View Post
I was messing around in the garage today and went to start my FS 55. It started after several pulls and I ran it with the choke closed for a good minute but as soon as i opened it up, it died. I am not sure if this is something to be concerned about or simply it is jetted too lean to run with temps in the 30s.


the most common cause of that problem is an air leak in the fuel line. having the choke on over comes the lack pressure due to the leak in the fuel line.

the second most common cause is a dirty or clogged carb

replace the fuel line first.
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Old 02-15-2014, 10:40 PM
rlitman rlitman is online now
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Is the primer bulb getting stiff? There could be a tiny crack there too.
Posted via Mobile Device
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Old 02-15-2014, 10:44 PM
themadcutter themadcutter is offline
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Quote:
Originally Posted by rlitman View Post
Is the primer bulb getting stiff? There could be a tiny crack there too.
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I have never had a primer bulb keep a motor from running.
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  #5  
Old 02-15-2014, 10:58 PM
tigerepairdotcom tigerepairdotcom is offline
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First try adjusting carb. If that does not fix it. Diagnose problem

https://www.youtube.com/watch?v=V9vT...ature=youtu.be fuel tank and vent pressure/vacuum test
https://www.youtube.com/watch?v=jlGggAEtLjY fuel filter and fuel line inspection and testing
http://www.youtube.com/watch?v=I5fQ4...ature=youtu.be primary compression and vacuum testing
https://www.youtube.com/watch?v=WdLZWYhlg18
youtube links
https://www.youtube.com/watch?v=e1mv...ature=youtu.be
https://www.youtube.com/watch?v=2xVy...ature=youtu.be
https://www.youtube.com/watch?v=iOwh...ature=youtu.be


THEEEEEEEEEEEEEEEEEEN

Or you can skip all that except adjusting carb and go straight to

Rebuild carb change fuel lines fuel lifter and bulb Basically Overhaul fuel delivery system.
__________________
It is very important for you to post your results once the problem is solved so that people will be able to reference a solution to their problem down the road. YEARS may go by and someone has the same problem PLEASE POST YOUR "IT WAS FIXED WITH x SOLUTION.
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  #6  
Old 02-18-2014, 11:17 PM
sr73087 sr73087 is offline
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Where is the best place to get Stihl replacement parts?
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  #7  
Old 02-18-2014, 11:24 PM
themadcutter themadcutter is offline
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Quote:
Originally Posted by sr73087 View Post
Where is the best place to get Stihl replacement parts?
only an authorized stihl dealer is allowed to sell new oem parts. there are some aftermarket parts available on line and used parts on ebay
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