I had Burning smell in cockpit after quick throttle-idle descent in Kitfox 5 with 912uls. This was after flying for 2 hours. The Oil Temp dropped to 116 and then smelled burning oil for a minuet. I currently do have the oil cooler partially blocked to deal with the engine getting too cold. Once I got the oil temp back up over 120 the burning smell was gone. Any ideas what happened here?