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Old April 10th, 2022, 08:37 PM   #1
pb3
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rear wheel sensor, sprocket change?

hi all,
noticed on my non-ABS '22 there is a "rear wheel rotation sensor." I have yet to find the rationale in the service manual, is this just for speedo operation or more?

also, anyone change sprocket sizes without an ECU fault generated?

tia,
parker
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Old April 11th, 2022, 07:10 AM   #2
DannoXYZ
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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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Old April 11th, 2022, 09:59 AM   #3
pb3
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sorry, no codes yet! and no sprocket changes. only 259 miles.
7.1% change, can you check my math to make sure I'm understanding...

on my 250, oem was 14/45. i installed 14/44. 3.214 vs. 3.143 meaning 2.2% change?

on my 300, oem 14/42, installed 14/40. 3 vs. 2.857 = 4.8%?
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Old April 11th, 2022, 11:22 AM   #4
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Math looks good.
What gearing are you changing to on 400?
Seems there's some annoying buzziness at 5500rpm cruising-speed that people change gearing to get away from.
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Old April 11th, 2022, 11:56 AM   #5
pb3
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i'm not sure, what are your suggestions? OEM is 14/41
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Old April 11th, 2022, 08:13 PM   #6
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Seems Ok ratio to me, I like it as it is. Try it and get used to it. Then when it comes time to replace chain & sprockets, you might have an idea of changes you want, if any. Most people add tooth or two for faster acceleration on track. Commuters add tooth in for more relaxed cruising.
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