399cc 80hp Stage 1 tuning

The Kawasaki ZX4RR 399cc 80hp produces 80 hp and 40 Nm as standard. The YASTUNING Stage 1 remap file takes it to 85 hp and 44 Nm, a gain of +5 hp and +4 Nm. ECU: Denso 21175-1643. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.