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@ hypophthalmus. I am surprised that this sounds like something you have never heard of. I take it that you have not changed the exhaust or intake air filter on your scooter. There are dozens of EFI tuners for motorcycles, ATV, wave runner, etc. When a exhaust and air filter are done it adds more air flow through the motor  but the fuel stays the same. This is still by the manufacturer and  programed into the ECU. The ECU will not just add  more fuel. It has a programmed MAP, this can not be done by the ECU and the O2 sensor. This is called a closed loop system. Some of the EFI tuners are: Dynojet power commander, Cobra FI200, Vance and Hines fuel pack, Arlen Ness Big Shot, Dobeck EJK, etc. etc. I think that out should do a Google and YouTube search on motorcycle EFI tuners and then maybe you can understand what I mean talking about.

Has anyone added any type of fuel tuner on their scoot. I'm just thinking that if and when I upgrade an air filter and exhaust for better air flow that the fuel injectors will need more gas. Can't find a tuner for my GT 300i. I like the EJK but they don't have one specific for the GT 300i.