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Old March 26th, 2021, 10:37 AM   #1
Based12
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Name: Erik
Location: Castellon, Spain
Join Date: Mar 2021

Motorcycle(s): 2010 Kawasaki Ninja 250R, 2004 Piaggio Typhoon 50, 1992 Yamaha SR 250 Classic

Posts: 10
Speed sensor?

Hi! My recently purchased 2010 fuel injected 250R shoots an FI light sometimes past 8500 RPM.

I used the code reader (yellow cable thingy) and it drops 24 and 25, which seems to be the speed sensor, open or shorted cables.

I detached it from the bike, thoroughly cleaned it, used contact cleaner on all contacts, and the light still shows most times the engine goes past 8500 RPM.

Any idea about diagnosing it? Checked my service manual and it doesn't specify any procedure or check, it only says to buy a new speed sensor.

Thanks!
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Old March 28th, 2021, 09:37 AM   #2
Based12
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Name: Erik
Location: Castellon, Spain
Join Date: Mar 2021

Motorcycle(s): 2010 Kawasaki Ninja 250R, 2004 Piaggio Typhoon 50, 1992 Yamaha SR 250 Classic

Posts: 10
Could a loose chain cause it? I'm still waiting on a rear lift so I haven't put it to spec still, and the upper part of it touches the swingarm when stationary
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Old April 7th, 2021, 03:40 AM   #3
Based12
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Name: Erik
Location: Castellon, Spain
Join Date: Mar 2021

Motorcycle(s): 2010 Kawasaki Ninja 250R, 2004 Piaggio Typhoon 50, 1992 Yamaha SR 250 Classic

Posts: 10
Also, the light only shoots when going past those rpms while in motion. Does anyone at least know what does said speed sensor do? I can't find any info on the Internet, and I'm not keen on rolling around with a FI light on
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