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MS660 Decompressor valve


Forest2Furniture
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I've got a little (I hope) problem with my Stihl ms660

.

Did some milling yesterday, saw started great.

Finished the cut, stopped the saw, moved board.

 

Went to start saw again - no decompressor button!

Eventually found it on ground by tree trunk.

 

Has anyone got any ideas why it's come out, is it a common fault and more importantly will it cost me a fortune to repair?

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Just read the last post - oh bugger:thumbdown:

Think I would pull the cylinder off and check out the damage to the piston crown, cylinder walls and cylinder top.

 

If you are lucky, all will be fine, if you are not then it could be ans expensive repair.

 

You could inspect through the spark plug hole and extract the thing through the hole or exhaust port but know what I would do if it was my saw.

 

Spud

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Thing is, it started, I then cut a 9' plank of Yew without a problem.

It wasn't until I came to start it the next time that I noticed the button had fallen off, found it at the end of the log.

 

So, if there was any real damage it would have stopped the saw, yes?

 

Think I'm being to optimistic aren't I?

 

Bugger!

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Could have been lucky and it only fell into the cylinder when the saw had stopped.

 

You have to get it out before you even think of pulling that starter cord.

 

 

Actually you want to make sure you dont rotate the engine even a tiny bit as it could get caught in a transfer port and damage the piston/rings etc.

 

Maybe whip the exhaust off, have a look inside and see if it will come out through the exhaust port(it should do).

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