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CBR600 Dodgy Tacho

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Python15
L Plate Warrior



Joined: 15 Sep 2021
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PostPosted: 09:09 - 15 Sep 2021    Post subject: CBR600 Dodgy Tacho Reply with quote
Good Morning! Brand spanking new member so please tolerate me. I have an irritating problem with my CBR600F3(T) tacho. It works grand up until about 7 to 8k then begins to go nuts, bouncing from nearly end stop to end stop. If I drop the revs back off, the tacho starts to behave normally again. I've read a few forum replies regarding tacho problems but have never read one associated with this type of problem. Any help would be appreciated greatly.
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 09:19 - 15 Sep 2021    Post subject: Re: CBR600 Dodgy Tacho Reply with quote
Python15 wrote:
Good Morning! Brand spanking new member so please tolerate me. I have an irritating problem with my CBR600F3(T) tacho. It works grand up until about 7 to 8k then begins to go nuts, bouncing from nearly end stop to end stop. If I drop the revs back off, the tacho starts to behave normally again. I've read a few forum replies regarding tacho problems but have never read one associated with this type of problem. Any help would be appreciated greatly.


Electronic or spinning cable drive?
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Ste
Not Work Safe



Joined: 01 Sep 2002
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PostPosted: 09:52 - 15 Sep 2021    Post subject: Reply with quote
It's electronic.

Some possible options / causes:

https://www.bikechatforums.com/viewtopic.php?t=177032
https://www.southbayriders.com/forums/threads/76217/
https://www.fireblades.org/threads/95-f3-tacho-problem.75938/
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Python15
L Plate Warrior



Joined: 15 Sep 2021
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PostPosted: 09:58 - 15 Sep 2021    Post subject: Re: CBR600 Dodgy Tacho Reply with quote
Nobby the Bastard wrote:
Python15 wrote:
Good Morning! Brand spanking new member so please tolerate me. I have an irritating problem with my CBR600F3(T) tacho. It works grand up until about 7 to 8k then begins to go nuts, bouncing from nearly end stop to end stop. If I drop the revs back off, the tacho starts to behave normally again. I've read a few forum replies regarding tacho problems but have never read one associated with this type of problem. Any help would be appreciated greatly.


Electronic or spinning cable drive?


I believe it's electrical. Pity it isn't a cable, would be easier to sort out .

@Ste, had a look at the first link, THAT looks hopeful! Rusty screws! That could be it, cheers.
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F18
Renault 5 Driver



Joined: 04 Mar 2019
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PostPosted: 16:10 - 15 Sep 2021    Post subject: Reply with quote
Just as a quick sanity check; prove the charging voltage isn't going ape. Stick a meter across the battery, rev to 5k and ensure the terminal voltage stays below 15.5v (for double proof rev to 7-8k).

Something easy to eliminate (well, easy if all okay!).
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Old Thread Alert!

The last post was made 3 years, 295 days ago. Instead of replying here, would creating a new thread be more useful?
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