Hey all I need help with identifying this OS carb. It is being used on a old original German Seidel 770 radial engine. It ran poorly upon first start up ( used engine, no history) mid range ok, but no low speed or wot After disassemblly and cleaning. I now have a reasonable low speed operation but the engine still dies upon wot. And won't idle reliably without glow plugs ignited externally during idle or it will quit. Anyone know this carb and adjustment procedures? Thanks