Malfunctioning Chainsaw Cutoff Switch - STIHL MS250


  #1  
Old 05-09-18, 07:44 AM
T
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Malfunctioning Chainsaw Cutoff Switch - STIHL MS250

Good morning, all.

I'm having a bit of an odd issue with my chainsaw (STIHL MS250) in which moving the switch to the top position fails to turn off the engine. I have to pull the connector off the spark plug to cut it off.

When I move the switch through the four positions, something feels either slightly loose or possibly disconnected but I'm not really sure what I'm looking for.

Additionally, the back cover of the housing appears to mount fine but seems to be preventing the switch from moving fully to the off position when installed though I can't see anything impeding its movement.

I've attached four photos to this post in the hope someone can see something I can't. It seems likely this is something very minor and easy to fix so I'd hate to take it to the dealer and pay for service if that is the case.

Thanks very much in advance for any insight!

UPDATE: I feel like this is related and another indicator something is loose or disconnected... You can see in the second photo, where the switch is in the 'On' position, that the lower interior cylindrical portion of the switch component has been lifted away slightly from the orange plastic base on which it rests. (Look straight down from the large chrome bolt in the photo.) It only does this in this position. When in the other three positions, it rests on the orange plastic as intended.
 
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Last edited by ThrasherFan; 05-09-18 at 09:24 AM.
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Old 05-09-18, 09:25 PM
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That black switch part should sort of snap down into the orange base. The piece with the spade terminal on the wire should touch the metal clip underneath it in the off position.
 
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Old 10-08-18, 08:38 AM
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The flat metal spring should be on the top of the black part. It slipped under when the black part popped out of the orange part. (it just snaps in)

Hope this helps, Roger
 
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Old 05-05-24, 09:14 PM
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Thanks. I had the same problem today. That fixed it. Had the same problem quite a while ago, same fix, but I had forgotten. Happens a lot when taking the cover off, especially if you lave the switch in the off position. Need to put in full choke position to get cover off to clean the breather/change spark plug.
 
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Old 05-06-24, 05:04 AM
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The top half of the cover should hold the shaft of the control lever concentric when the control is rotated. Can't tell if top half has a gate for control positions but it, or the lower half of the cover, must allow the spring end of the shorting wire on control lever to contact the flat ground strip when the control lever is at its lowest position.
 
 

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