I just maidened my GPUltimate yesterday with a DLE 55. The engine sat on a shelf in my shop for two year's. I was a little concerned. But man-o-man that thing is sweet. Choked till pop, choke off and vvrroomm. After the first flight tweaked the needles just slightly, still rich though, and what a rocket. Four flight's today and all started with a flip. One sweet engine.