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  #1  
Old 04-18-2013, 09:51 PM
MisterBreeze MisterBreeze is offline
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Stihl FS 90 valve problem

Trimmer is about a 1 1/2 yrs old. Used it all day today and ran fine. Went to start up and it sounded funny when i pulled the cord. Would not start, checked the valve and find the exhaust push rod is missing. I turned the trimmer upside down and out it came. Any ideas as to what happened?? Thanks
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  #2  
Old 04-18-2013, 10:06 PM
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Snyder's Lawn Inc Snyder's Lawn Inc is online now
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Quote:
Originally Posted by MisterBreeze View Post
Trimmer is about a 1 1/2 yrs old. Used it all day today and ran fine. Went to start up and it sounded funny when i pulled the cord. Would not start, checked the valve and find the exhaust push rod is missing. I turned the trimmer upside down and out it came. Any ideas as to what happened?? Thanks
See if its bent
Check the rocker
Put rod back in and pull it slowly see if it falls out again if does I say the valve is stuck
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  #3  
Old 04-18-2013, 11:45 PM
herler herler is online now
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I am starting to think in the direction of shortblocking it.
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Old 04-19-2013, 06:23 AM
MisterBreeze MisterBreeze is offline
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Originally Posted by Snyder's Lawn Inc View Post
See if its bent
Check the rocker
Put rod back in and pull it slowly see if it falls out again if does I say the valve is stuck
Rod is not bent. When put back in rod falls in block.
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Old 04-19-2013, 02:41 PM
ricky86 ricky86 is offline
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It could be because the valve needs adjustment. That's usually what the problem is, but you have to get it back into the follower first
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  #6  
Old 04-19-2013, 06:50 PM
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CkLandscapingOrlando CkLandscapingOrlando is offline
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Is the retainer on the valve?
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Old 04-19-2013, 06:55 PM
MisterBreeze MisterBreeze is offline
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Is the retainer on the valve?
Not sure what the retainer is
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Old 04-19-2013, 07:03 PM
ricky86 ricky86 is offline
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Do you know what the follower is?
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Old 04-19-2013, 08:45 PM
MisterBreeze MisterBreeze is offline
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I don't , but was able to get push rod back in place. Once assembled, I will try to start
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Old 04-20-2013, 12:01 AM
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CkLandscapingOrlando CkLandscapingOrlando is offline
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The retainer hold the spring down and valve up. If it broke the valve will drop and rocker arm gets slack. I dont think a rod should just fall out of place. I am replacing a bent valve in my 4 mix shears in the am from a broke retainer
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