Hi everyone, Just scored a very nice - lightly used Husq 55 for $70! Compression is reading at 170! Actually, it's a bit of a bear to pull over with the compression so high - I think a decomp valve would lighten the strain on the recoil. The saw has no decomp valve now, but there is a machined opening in the cylinder to accept one (the opening is absolutely clean - I don't think there was ever a valve installed, but not sureh. I've see some 55's with the decomp valve- so........can I just buy a valve and install, or is there more work to do to allow the valve to work? Thanks! Cheers!