While fuel injection is more complex to diagnose and repair, the truth of the matter is that in most cases it’s MUCH MORE reliable compared with the average carburetor. That part of the scooter is virtually maintenance free. Use clean fuel, replace fuel filter on schedule, that’s about it for the fuel system.
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I think in countries like the US carbs might be seen as "less reliable" for two main reasons:
1. Most available gasoline gets mixed with Ethanol.
2. Most scooters and motorcycles do not get used during long, cold winters.
Ethanol itself is corrosive, starts breaking down within a relatively short period - and will easily gum up a carb if the scooter
doesn't get used during a long winter. To my mind leaving a mixture of Ethanol and gasoline inside a carb bowl for a couple of months during winter could easily become a sure recipe for carburetor problems.
It would be interesting to know whether scooters in countries like the US comes with fuel hoses and fuel tanks which are suitable for ethanol ? As far as I know special hoses and fuel tanks needs to be used when Ethanol gets mixed with gasoline - because ordinary hoses disintegrate and ordinary fuel tanks do rust if an owner do not care about preventative treatment. This can obviously cause problems as well.
In countries with warmer climates, (like South Africa) scooters and motorcycles get used 365 days per year, and our gasoline does not get mixed with Ethanol. Which means chances are very slim that gasoline will get stale inside carburetor bowls, and we hardly ever have carburetor problems. Whenever carburetors give problems after many years, it usually just need carb kits which are dirt cheap.
Having said this - my previous bike was a Honda NC700, which came with a FI system which never gave any problems. But I am aware of two cases on these bikes where the computers on the FI systems had to be replaced under guarantee. The pure idea of replacing a very expensive computer out of my own pocket gave me the shivers.
I must admit - I always liked "fiddling" on my motorcycles, and the idea of doing things myself just gives me some extra "freedom". At least I can ride knowing that I can keep myself mobile.
Maybe that's the main reason why I prefer carburetors.