I had a very similar problem with primus stove. It work amazing for a couple of weeks then basically i had to strip it to the bones every week. then every day.
I think the jets are just no good, after replacing the jet ( to the wrong one) i had the above repeated but we are talking first few days it worked then i had to strip it. Rinse and repeat.
I assume you do have the correct jet in. Mine came with several (lPG/ Petrol? and i cant remember what else)
Basically i think they are only really rated for Ultra-pure fuels like shellite, white gas, ,,,,,(nnot kero) Maybe try running on ultra high octane fuels (98 and the like) or even ethanol?
sorry cant be more help i never did sort it out, I ended tossing it and going back to my clunky industrial but never failing MSR whisperlite...
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