An old thread on here made me think about this five year old Polaris. It's my only non-vintage Optimus, so I can't gauge if this is simply the sound/behaviour of a healthy copy of modern Optimuses. I went from shrugging my shoulders to just wanting to know. That's what happens when I put a pot on it. It pulses like a helicopter. Initially I figured "this is how the stove sounds" but then read people solving this with valve adjustments, spreader plate height changes, varying the number of pumps, fresh fuel, and even using a Primus pump (and ran a Whisperlite Uni off the Optimus pump perfectly BTW), etc. None of these tweaks altered the pulsing. I've disassembled it and cleaned thoroughly and checked orings, replacing one that really didn't need replacing but was closest to it. So is this normal? Did everyone who has this just buy a Polardog and call it a day, because it simply sounds like a stove that can't burn fully, but I can't even approach the experience level with Optimus burners that some of you have.