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« on: 23 March 2014, 09:45:02 pm »
The FZ6 uses a de-tuned (or re-tuned, for more low-mid range power, and re-tuned again on the S2 bikes).
Many people will tell you that an ECU swap will give you the R6 power (and delivery) but not so; the cylinder heads are different and (as far as I know anyway) are NOT a straight swap. Even between the '04-06 FZ6 and the '07 FZ6 S2 bikes, the fuel maps are different, along with numerous cosmetic and chassis changes (different swingarm, front mudguard and differences in the fairing. Can't speak for the FZS bikes, but the FZ6 and R6 certainly don't share a Haynes manual either.
The principal for de-tuning (or re-tuning) an engine is a purely financial one; it costs a hell of a lot of dosh to design an engine (and indeed, a bike) to meet a given target (in the R6 case, it was developed ultimately for track success). By taking an existing (if previous-year) engine, modifying it, and wrapping it up in a budget chassis / suspension combo, we the people get real-world power and performance for the road, at a sensible price, thus increasing sales (ie, off-setting some of the development costs, by sharing an engine across different models). Suzuki's Bandit and Honda's Hornet 600s came about exactly the same way (de-tuned, ex sports-bike motors).