MS660 Decompressor valve

[Forest2Furniture]

Thanks, will try that.

[18 stoner]

It is very unlikely to have damaged anything if its not been turned over since stopping it.

 

Sounds to me like the nipple that bungs the decomp hole will have stayed in place while the saw was running due to the compression, even if the head of it had fallen off.

 

Once stopped the nipple may have then fallen inside the pot, therefore the only damage likely to be caused would be by trying to turn it over.

 

Personally, if this is what has happened I would still take off the pot and inspect, unless you are absolutely sure you have all the bits of the decomp button, and it hasnt been turned over after stopping it.

[geoff]

Be carefull,it could have gone down a transfer port into the crankcase and be out of sight,I may be wrong on this as I have not seen the 660 internals,but I would have the barrel off,blow out the crankcase with the saw upside down.

I stand to be corrected,but it could be a concern,as you would not see the bit if you dont take the barrel off.

[Forest2Furniture]

I can hear it rattling around the cylinder head, so if I can get it out of one of the holes and match up all the bits I'm hoping that it'll be Ok.

[Forest2Furniture]

Bit miffed really as it's just come back from having a new piston and rings fitted and this is only it's second time running!

[spudulike]

Personally with a saw worth that much, I would take the head off and inspect the damage, at bare minimum, make sure the loose bit is removed and hopefull all will be good but a strip down would be a couple of hours well spent!

 

Spud

[Forest2Furniture]

Got it!

 

Now, in my book the part number is 1128 020 9400 but when I look online all the stockest are quoting number 4223 020 9400, is it the same part with two numbers. If not which one is for the 660?

[spudulike]

Got it!

 

Now, in my book the part number is 1128 020 9400 but when I look online all the stockest are quoting number 4223 020 9400, is it the same part with two numbers. If not which one is for the 660?

 

Part 1128 020 9400 is on the IPL

 

1128 020 9400

 

Give Andy my regards:thumbup:

Spud

[Forest2Furniture]

Thanks,

have just ordered one.