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Tachometer not working
Posted: Wed Apr 30, 2008 1:32 pm
by malibu55
I am getting my '85 RZ500 (Cdn.) back on the road after sitting in my garage for 15+ years. It only has 6000 kms on it and is in excellent condition. I have re-built the carbs and all that stuff and it started up and seems to run great (no road test yet as front brake needs bleeding).
The tach however is motionless. It never malfunctioned previously.
Any suggestions out there? Bad ground, etc.?
The rest of the cluster is working fine....temp gauge, idiot lites, etc.
Posted: Thu May 01, 2008 3:12 am
by Matty
What's your battery like?
I think the tacho needs more power to operate than the instrument lights so the tacho drops out first.
Posted: Thu May 01, 2008 8:30 pm
by malibu55
Thanks for the reply.
My battery is brand new. What sends the signal to the tach?....a sensor on the cdi unit?...YPVS control box? I'm thinking it is a bad connection somewhere like that but I don't know the circuitry or how the tach actually works.
Posted: Fri May 02, 2008 8:52 am
by Mike Cichetti
Sometimes when the bikes sit I've found that the tach binds or gums up. Take it for a decent length ride, making sure the battery is good and you just may find it will slowly come back to life. I think they jus tget stuck from sitting in some cases. After 40 or 50 miles it may be fine. Good Luck!
Posted: Sat May 03, 2008 11:27 am
by malibu55
Thanks Mike. I'll try that technique. I am sure you're right.
Posted: Thu Jun 05, 2008 11:33 pm
by malibu55
Mike,
I just did a short test ride today and sure enough the tach needle started creeping up the scale as I drove along.......not following the revs up and down but rather increasing and staying high.
As soon as I returned home it slowly started to return to zero....within a few minutes it read zero again. So, I am confident your advice is right on....it just needs a little more work and some summer heat.
I will advise once I get more miles on her.
Posted: Sat Jun 21, 2008 8:56 pm
by malibu55
Mike,
I now have about 60 kms (36 miles) on her and I am happy to report the tach is following the revs up to approx 4k. I am sure it will come around very soon.
Posted: Sun Jun 22, 2008 1:12 am
by Mike Cichetti
Glad to hear it's working.
Posted: Sat Jul 05, 2008 11:25 am
by malibu55
Mike,
My tach is now fully functional after 100kms.
Thanks again.
Glenn
Re: Tachometer not working
Posted: Sat Jul 18, 2015 4:15 pm
by PilotMarky
I have the same problem. Bike stood for 25 years. Hopefully mine fixes itself after a bit of riding.
Re: Tachometer not working
Posted: Sat Jul 18, 2015 8:34 pm
by Mike Cichetti
Just give it some miles and see what happens.
Re: Tachometer not working
Posted: Tue Sep 08, 2015 10:15 pm
by PilotMarky
Yep! Working perfectly now after similar number of km!