It is a somewhat erroneous description of what is done when a tech with appropriate equipment downloads new software into the ROM (memory) of the ECU. Basically they are overwriting the programming (we call it maps, but there is more to it than that word insinuates) with new programming.
I used to be fast....now I just dream about it.
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'08 910R (Gina), '04 F4 SPR #275 Track Bike (Lola), YSR50 (The Rabbit) restoration project, '71 CB100 "Lil' Red", '73 RD350B (Orange Bird) restoration project, '08 TT-R110 (Buster) Pam's ride, '05 TT-R230 (Dirty Girl), 2015 Indian Chietain (Rita) my "low-n-slow".