Odometer reset at start up???? - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 31 (permalink) Old 12-31-2011, 01:02 AM Thread Starter
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Odometer reset at start up????

- I use my Odometer to track mileage fuel consumption and determine when to fill up (like most of you I am sure)

- Not a lot of time on this machine

- Noticed the OD reset to 0 miles during trip and attributed it to a double bump or long depress which could have caused this and wrote it off

- Did it again a week later???

- This morning I checked before I pulled out and it was 0 miles (after being set at fill up 30 miles or so prior). I even pulled off my glove this time going from engine temp (which i usually have displayed) to make sure I feel one single crisp button momentary action and not holding down.

Can some one explain whet I am seeing? Is it a bad meter? Am I just a dork?

2004 RC51 Nicky Hayden, PCMIII, Sato-Low Mount
1994 FZR600, KTMSXC625 Thumper, Honda Metro, 150cc Puma
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post #2 of 31 (permalink) Old 12-31-2011, 01:45 AM Thread Starter
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Ok and a quick additional note..I had not seen this problem until I started using a lithium battery. I doubt this is related but wonder if the voltage was so low during start up cranking that the processor on the meters core dropped below critical. If this were true it would not explain why I saw this on the road while running and would also mean that the value (OD miles) is stored in a volatile state (as opposed to non-volatire memory, sorry I am an engineer).

2004 RC51 Nicky Hayden, PCMIII, Sato-Low Mount
1994 FZR600, KTMSXC625 Thumper, Honda Metro, 150cc Puma
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post #3 of 31 (permalink) Old 12-31-2011, 03:00 AM
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its the battery. mine does it too when its below 50. the ultralight batterys are great, but if it is below a 10 cell this happens.
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post #4 of 31 (permalink) Old 12-31-2011, 12:43 PM Thread Starter
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Crap that's what I thought......I wonder it a capacitor would help with the voltage drop from the start up surge in current? Is it just at start up that this happens to you or does this happen while riding as well? I am running the Shorai lfx12a1-bs12 12AH Lithium LiFep04

2004 RC51 Nicky Hayden, PCMIII, Sato-Low Mount
1994 FZR600, KTMSXC625 Thumper, Honda Metro, 150cc Puma
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post #5 of 31 (permalink) Old 12-31-2011, 01:00 PM
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I agree it could very well be the battery.

^ Re-check the connections on your battery terminals to rule out loose wiring though.


When you start seeing your gauges "reset" or sweeping (when not a normal function check at start-up, of course), it usually indicates a weak battery...

G'luck !

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post #6 of 31 (permalink) Old 12-31-2011, 01:16 PM
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Just send me that Shorai and I will send you my Yuasa straight up.

Although I will be paying more in shipping due to the weight.

This is actually the first I have heard any issues like this with the Lith cells. So does this mean you should have bought a battery with more cells??

Good to know stuff here.



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post #7 of 31 (permalink) Old 12-31-2011, 01:39 PM
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mine only happens under initial start in cold temps.
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post #8 of 31 (permalink) Old 12-31-2011, 02:28 PM Thread Starter
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Fat chance Mad....

Its all about the ability to maintain voltage under load. More cells would just mean a higher voltage that the regulator would have to drop back down and create heat and hardship for the regulator in terms of power dissipation. So be careful guys in just adding higher voltage (more cell) batteries.

It also meant the OD value stored in memory is volatile. It also might mean I might be losing some other data. Now is this happening while I am running or just at max current draw (and battery voltage drop) is the question. I will see if I can get an oscilloscope on it next week at work and look at the voltage real time. I can also measure my total current draw at start up and idle. This should answer the question.

Oh and by the way its going to be 70 here today and sunny as usual.... maybe I will go for a nice ride

2004 RC51 Nicky Hayden, PCMIII, Sato-Low Mount
1994 FZR600, KTMSXC625 Thumper, Honda Metro, 150cc Puma
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post #9 of 31 (permalink) Old 12-31-2011, 02:50 PM
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" maybe I will go for a nice ride"
Ouch, you sure know how to hurt a guy in the frozen wastes. I've only had my RC for a few months so haven't seen the reset happen yet. Battery is on the Optimate now so won't know 'til spring

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post #10 of 31 (permalink) Old 12-31-2011, 04:42 PM
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Quote:
Originally Posted by madbuyer View Post
Just send me that Shorai and I will send you my Yuasa straight up.

Although I will be paying more in shipping due to the weight.

This is actually the first I have heard any issues like this with the Lith cells. So does this mean you should have bought a battery with more cells??

Good to know stuff here.
That's why I went with the 18 Ah Shorai vs 12 Ah version.
The weight difference is negligible while the while the additional cranking amps is worthwhile.
The lithium batteries in cold weather may require the ignition to be switched on for around 30 seconds before cranking.
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