Date: 08-11-25  Time: 08:47 am
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Author Topic: Rpm signal jumping  (Read 908 times)

petters

  • Cager in Training
  • Posts: 12
Rpm signal jumping
« on: 02 October 2016, 05:08:58 pm »
The rev counter on my bike has been jumping and falling out and beeing wild for a while now, and today I fitted a Koso and I still have the problem. Is there a sensor anywhere?
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darrsi

  • GP Hero
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  • Posts: 10,671
Re: Rpm signal jumping
« Reply #1 on: 02 October 2016, 05:36:59 pm »
Where is it jumping to and from, what rpm?
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petters

  • Cager in Training
  • Posts: 12
Re: Rpm signal jumping
« Reply #2 on: 02 October 2016, 05:39:08 pm »
Its all over, and sometimes when the enegine is not started, sometimes fron 2000rpm to 8000rpm and sometimes it shows nothing at all.
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darrsi

  • GP Hero
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  • Posts: 10,671
Re: Rpm signal jumping
« Reply #3 on: 02 October 2016, 05:44:43 pm »
On the right side of the carbs there's a Throttle Position Sensor (TPS), unplug it and see if the rpm needle becomes more settled, once unplugged it should go between 0rpm and 3000rpm.
If it does this in a controlled manner you may have a knackered TPS.


The black plug sits on number 4 carb with a wire going into it, you'll need a key or flat screwdriver to release the catch on it to unplug it.
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