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Old 08-06-18, 09:25 PM   #1
Bibio
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Default rev needle bounce

K7 twin spark.

i have never noticed this till now as i have always had a spaznav stuck to the rev counter. keeping a steady speed of say 60mph the rev counter needle bounces a little.

anybody else notice this or do i need to investigate?
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Old 08-06-18, 09:44 PM   #2
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Default Re: rev needle bounce

If there's noise on the input signal it could cause that (maybe a bad ground or a dirty connection at a plug/socket). I would imagine the tach has its own voltage regulator (ic) so if the regulation failed it could cause that or the mechanical damping on the tach meter itself.

This guy on the site built a filter for the input signal and thoughtfully documented it including videos of before/after:

http://forums.sv650.org/showthread.php?t=218851

I'd start by reseating connections first.
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Old 09-06-18, 12:32 AM   #3
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Default Re: rev needle bounce

its not bounce as such and more of a flutter of a few revs. all the connections are clean and have been sprayed with acf-50 then air dusted so there is just a light coating.

its no biggie in the grand scheme of things and wont notice when i stick the spaznav back on.. lol

might get the sds tool out and do a reset.
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Old 09-06-18, 07:20 AM   #4
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Default Re: rev needle bounce

May be vibration causing it on an analogue speedo, either from road or engine.
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