RE: DA-50 Walbro carb issues...
Suffixes generally denote different ways to connect the throttle, the internals should be the same...The very old G62 came with an HDA 48 carb..It didn't work quite right, so the high speed fuel nozzle inside was changed and the carb became the HDA 48C...A few years later the steel piece on the end of the throttle shaft was lengthened, the carb was then HDA 48 D..