MS660 and decomp valve

[Jkebxjunke]

I bought a MS660 off ebay... and I finally got around to working on it... and low and behold it doenst have a decompression valve... just a rubber plug where it should be. Now as I look at the parts manual for this it shows a decomp valve and a plug as an option.
Did some 660's come without a decomp valve? I haven't removed the plastic shroud yet to see if there is a plug under there.
or did I get a re badged 060? and did they come with decomp valves?.
From the parts list it looks like I can put a decomp valve in there if I want to.
Is there any advantages/disadvantages to the decomp valve.. besides the obvious easier starting.
As I get older I hate to work harder than I have to. and my kids are not old enough to be any help yet... LOL

 

[04ultra]

MS660's have decomp.....later 066's have decomp.......Some of the Aftermarket cylinders dont and people just plug the hole.....



Is it a Mahle cylinder??? does it have poly flywheel????


Post picytures of the saw....

 

[Jkebxjunke]

Ill see what I can do... I need to find my camera first... I think my 2 year old got a hold of it... it might be easier to go get a new one... ( my old one is a 2mp) I just heard a neighbor bought a 8mp for about $75.. make ya think