Just wanted to share some interesting photos after rebuilding my 32mm Flat Top Carbs after many (too many) years. First of all; I was hesitant to rebuild the carbs due to how well I "thought" the bike (78 R100/7) was running. It wasn't blubbering, stalling, or non-responsive at all. Smooth throughout all throttle transitions. On the average, my mileage was in the range 38 to 45 mpg. I knew the left carb mixture jet was not responding to adjustment but the mileage and performance of the bike was excellent if you were to ask me. Maybe after so many years I became a bit conditioned to it's general slowly degrading performance. I've never experienced so much gum and buildup inside my carbs, obviously a result of the gas we are receiving these days. The jet stock, needle jet and atomizer were covered with a syrup type of buildup.
By the way, the UC-20D Ultrasonic Cleaner is the only way to go. An intial 30 minute soak at 40??C with a 50/50 Simple Green solution and water brought an amazing amount of crap radiating from the body and associated parts. Then two seperate clean water rinses in the ultrasonic cleaner at the same time and heat level gave the bits a very high quality wash and cleaning. I highly recommend this method for the complete Bing service.
Left Bing (64/32/223):
Right Bing (64/32/224):
Looking forward to the results of my labor after new 52mm carb collars, new choke cables and Viton fuel line arrives.
It was pretty nasty in there with horrible condition of o-rings. All o-rings were either cracked, split, turned to mush or all of the above.
-Mike V. / San Diego