My ex-Norwegian army 111T burns pretty well (though I'd prefer me blue and less purple.... (See pics) . I'm running it on Kerosene (not sure what the last person used, but what I drained out was clear, slightly "thick" and more or less odourless so I'm thinking lamp oil.) The jet is new, so is the needle, and the regulator spindle. Pressure is good. All parts have been washed and scoured. BUT: Despite a fairly healthy flame in the "mid-range" of the regulator when I try to regulate down to simmer it turns into a yellow flame without power. ... And similarly if I open it towards the needle rising it turns yellow. The spindle is quite stiff to operate... The original was badly worn with a "ring" round the tip. I have another 111t which is beautifully controllable (though with more power (pot stands quickly glow red!) and a purer shade of blue), so it's not operator error I don't think..... Any suggestions as to the problem???? ALSO: I've read about running a stove like this dry, and I thought I'd burn off a couple of tanks to try and help clean out the system. But this stove stops working somewhere just under halfway down the tank (the pipes inside the tank are visible above the fuel).... The blue flame ceases and although I can hear hissing there's nothing coming out that I can light!!!.....(though still plenty pressure). Anybody have any feedback on that? If I add fuel to the tank it'll fire up. Thanks for all input.... I've searched for answers so posting is plan B. There always seems to be help to be found among the members here. Regards, Martin.