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Rear-wheel speed sensor is for ECU to determine what gear you're in for gear-indicator on dash. Is it still indicating correct gear?
What ECU code# are you getting? If it's #25, it's gear-indicator routine that's complaining about new engine-speed to wheel-speed ratio. How many teeth did you change sprockets? Seems limit is right around 7.1% change or more is when it starts complaining.
To clear and reset error code:
- unplug clutch-switch under clutch lever
- jumper connector on harness side with U-shaped wire, or paper-clip (warning: this will allow bike to start in gear. So make sure it's in neutral with clutch-lever squeezed before starting).
- start engine and idle for 30 seconds.
- ride for at least 10 minute with 5 or more minutes above 20mph.
- turn key off to shut bike down
- repeat 3 more times
- on 4th start errors will clear and everything functions normally again
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