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Not in my 066 and ms440. The hole is drilled full diameter through the cylinder wall. Both décomp valves have a full access to the inside and their obturator is about flush with the dome's surface. If the little retaining rod breaks, the obturator will make a mess.

I use the decomp valve on the 440 , 066 and 3120xp, but only for a hot start. When the saw is cold, it seems to take forever to prime the carb, even with the starter "on", if the decomp is activated. So, no decomp and a manly pull until the first "Burp !", then decomp for the actual start.

You make two gaskets from a tire tube, one plain, one with the valve in the middle. Put the plain between the muffler and the cylinder to close the gas exit, same with the valve on the inlet, but screw it with a hollowed plate instead of the carb. Close the impulse tube (if it's separated from...