Grizzly Engine & Transmission Weird valve question. January 14, 2016 When setting the exhaust valves, it calls for .15-.20 mm. But what I don’t understand is the fact that the decompression pin should be holding that one exhaust valve open a bit. Does this not effect the clearance adjustment? (600 Grizzly). Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related