varminter

I got a problem with my Primus Gravity MF 2. It doesnt start burning properly after being preheated. It seems like it keeps burning at the nozzle and inside the housing. I just get a lot of big yellow flames. I cleaned the nozzle and that seems fine. Anybody got any ideas what else I should try? I have the stove already 4 or 5 years without any problems. I use rodsprit to burn. Please answer på norsk, i understand it very good, but writing is difficult.