XL125V2 Speedometer bouncing up and down

[CraddyMcPatty]

I purchased a XL125V2 a few months back, and it has had issues with the speedometer where it completely doesn't work, and sometimes jumps up to top speed, sometimes in the middle, it's really random, usually when it's idling or riding.

The suspicion is the speed sensor, but the OEM original ones are WAAYYY too expensive, so I want to ask if there is anybody who would know any possible solutions? Anybody who has had any similar issues? Maybe know a cheaper alternative for the sensor?

[S Barker]

I only have a manual or a 2012 XL125. and I'm not sure what year a "V2" model would be but I dont think the speedo system will be much different.

I've attached the fault finding section for the speedo from the 2012 manual.

Spending time to try and identify the problem before paying for replacement parts is always a good idea.

If the fault is intermittent faulty or corroded connectors and earth points would be prime suspects.

[CraddyMcPatty]

I only have a manual or a 2012 XL125. and I'm not sure what year a "V2" model would be but I dont think the speedo system will be much different.

I've attached the fault finding section for the speedo from the 2012 manual.

Spending time to try and identify the problem before paying for replacement parts is always a good idea.

If the fault is intermittent faulty or corroded connectors and earth points would be prime suspects.

Thank you very much but it's a 2002 
I have the Haynes manual for it, but it doesn't tell me too much about troubleshooting exactly what I'm having.. could be bad connectors, could be the sensor, but thank you very much 

[S Barker]

I think the fault finding section for the sensor would still be applicable.

[SpiderSpit]

I posted the full service manual in my post  electrical problems suck on this bike, if i remember right there is ways to troubleshoot some on the last pages of the bike, electrical diagram too.

My issue is the dash light will constantly burn out over 2months time even tho the bike outputs a stable voltage, i ordered some Lower output LEDs to the previous High power LEDs i had installed, halogen are a no no. If you need any help with lights, i would be happy to share my knowledge. Got LED replacements for every part of the bike thats fits amazingly, as for the speedo bouncing, could either be the motors inside the dash or the cable, OEM is expensive yes, but what i learned from honda bikes its the best to do so. Check ali express for replacement, i believe the cable is similar to what they have on other models like the cbr and f, it could be something else and not the cable, i havent looked into the mechanism.

[CraddyMcPatty]

I posted the full service manual in my post  electrical problems suck on this bike, if i remember right there is ways to troubleshoot some on the last pages of the bike, electrical diagram too.

My issue is the dash light will constantly burn out over 2months time even tho the bike outputs a stable voltage, i ordered some Lower output LEDs to the previous High power LEDs i had installed, halogen are a no no. If you need any help with lights, i would be happy to share my knowledge. Got LED replacements for every part of the bike thats fits amazingly, as for the speedo bouncing, could either be the motors inside the dash or the cable, OEM is expensive yes, but what i learned from honda bikes its the best to do so. Check ali express for replacement, i believe the cable is similar to what they have on other models like the cbr and f, it could be something else and not the cable, i havent looked into the mechanism.

Thanks for the feedback, I think after some thorough checking, it is in fact the speed sensor that has been broken by previous owner(s). Do you have the specific model & year of the bikes that use the same sensor? Would be largely appreciated as I am looking around for used ones in the country from parted out bikes 

[CraddyMcPatty]

Hello again, long story short: The speed sensor has super thin wires inside that managed to break at some point, probably after a crash or when someone tried dragging out the sensor without unscrewing it or something.

All in all, bought a used speed sensor from an xl125v1 (with the magnets n stuff attached) for around 75 euro (890 NOK) and swapped out the whole "speed-reading-system". Now my odometer and speedometer works like a dream