Is there some advantage to running carbs for racing? Or is it just because they've been able to stay competitive with what they've got so far? You'd think, given how they've gone to EFI on everything except the old 550, that the IQR would have followed suit unless switching over wouldn't make much difference. No idea here, although I am one of the few who still likes tinkering with carbs...
I personally think that benefits of fuel injection outway the benefits of carburetors and in general neither will give you more horsepower and have comparable fuel economy.
The benefits of a carb'd motor are that they are more affordable to tune and and maintain.....a few jets are cheap when compared to a laptop and fuel mapping software.
I think that the push of the fuel injected race sleds is based on the environmental considerations. In general carbs have a, "Bowl" of gasoline that is pulled into the carb assembly by a float valve. This process is not very precise and carbs are vented to the amosphere which allow for the VOCs to escape.
Fuel injection systems are pressurized, closed systems, that are very precise.
I'm not sure why the Polaris race motor is still carbureted, but i'm sure it helps out the grassroots, pickup truck, racers.
