A little weird? That's downright odd. I assume you ruled out canister cooling from within and the subsequent pressure drop (I mean you know too much about this subject to get tripped on that).longri wrote:The symptoms were a little weird. With a newer canister it would work flawlessly. But once the canister got down to about 1/4 full the stove would simply stop working at all. It was either 100% or zero. I tried cleaning it and got nowhere. I figured there was something deep inside the valve that got gummed up with that fine dirt somehow.
I'm at a loss to think of circumstances to explain the 1/4 tank issue. Cooling could cause that, particularly with 100% butane which is what puncture type canisters were back in the day, but warm up the stove a bit, and it should roar again with the same canister.
If you used CV206 cartridges, there could be some problem with the "valve" if you had later model canisters. The valve was a little plastic flap that would (hopefully) spring back into place if the canister were removed from the stove. Not sure I'd want to try that.