The bicycle may be primitive, but it works! I just sold my 88 Toyota pickup with over 250,000 miles on it. The carb was never touched on it. I had a Datsun that I put over 250,000 mi. on Same deal. My 89 Honda has a carb. It starts perfectly and runs like a top at 150,000. Carbs have propelled cars and trucks for billons of miles. When one does fail you can replace it cheaper than the diagnostic cost on an injector system. I may be a dinosaur but when you get any system so complex that even so called experts have to throw parts at it to diagnose, then in my opinion, you have not progressed.
There are also other fuel management systems out there that are more simple and work just as well. My quest is to find one.