Decompression valve pressure setting

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mrman21

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Hi all .I have recently added a decomp valve to a Stihl 064 and it keeps popping off on first comp stroke not fire stroke . Can I increase pressure setting to get it to close on fire stroke .
 
How did u install it? 064 OEM cylinders don’t have deco hole?
where did the deco valve come from?
pics
 
I removed plug in top of head . Got it from an Ebay site from Germany listed for 064 .
 
Didn’t know 064 came with deco plug hole?
original cylinder?
if offshore deco valve could be reason? Did listing state oem or original or says will fit or replacement.
is cylinder modified?
 
Don,t know if cylinder or deco is oem . Bought saw off Flebay about a month ago . I was hoping to increase release pressure so I wouldn,t break another pull cord .
 
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