02-07-2022, 09:23 PM | #1 |
Join Date: Mar 2021
Posts: 40
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How to set old mileage on new speedometer
I’m getting a new Zanella cluster next week. I would like to start the new odometer at my current mileage which is around 1800 miles. Could I use I drill on the new wheel speed sensor to run the mileage up? I was thinking of using a cone shape dowel of some sort. Any suggestions on how to do this?
Thanks. |
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02-08-2022, 05:14 AM | #2 |
Join Date: Jun 2020
Location: A small country with a funny name
Posts: 164
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Sure you can. Depending on the type of cable terminal, you may be able to just pinch it in a drill's 3-jaw choke and spin away. Keep in mind that this is not a fast method by any means -a 1800 rpm cordless power drill only got a Yamaha XT600 speedo I have up to an indicated 60-70 km/h.
Depending on the odo mileage you're trying to match, it may take a looooong time to complete the job. Even with a 3000 rpm drill, and an entire day of "riding" the odo in this way, you will not be able to put more than 1400 or so miles/day on it. And that is, with the drill constantly engaged and rigged. Even if you jury-rig the drill to drive the speedo gear instead of the cable, you cannot go any faster than the maximum registerable speed, -so again, we're talking about hours or days of spinning. With it being so time-consuming, it's no wonder that mileage matching is often performed by the seller at a charge. Then again there might be some hidden setting... |
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02-08-2022, 09:01 AM | #3 |
Join Date: Jun 2021
Posts: 80
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The speed sensor with the digital cluster is a magnetic sensor.
It is possible to flash the chip that contains odometer information, but I don't know what chip contains that information, how to connect it to a computer or how to read and change the raw binary data. Try getting ahold of the seller and ask if they can do this for you and how much they'll charge. |
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02-08-2022, 09:32 AM | #4 |
Join Date: Jun 2020
Location: A small country with a funny name
Posts: 164
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You can use the drill method with a magnetic sensor as well, just a different kind of jury-rigging is required. You don't want magnets flying around like bullets, for one. Or, if you want a more refined approach, attach a digital signal generator to the speedo's input in order to simulate the pulse from the magnetic pickup.
A really ghetto way to do this would be to use a computer or other audio player as a generator and play back this pulse through the headphone jack, with a suitably modified lead. A low audio level should be enough to trigger the electronics in the cluster -just don't overdrive them! There are even real-time signal generators apps you could experiment with. |
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02-08-2022, 09:59 AM | #5 |
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Personally I wouldn't even worry about it. It's only 1800 miles and really won't make any difference in value a few years down the road. I would just get out and enjoy the ride.
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02-10-2022, 05:48 AM | #7 |
Join Date: Oct 2020
Location: Flower Mound Texas
Posts: 904
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I was thinking that if you're going to use the drill idea, you might want to take your time and not get too crazy with the rpms, and let it cool off every few minutes. I can't imagine the speedometer is lubed particularly well or made with parts that would take allot of heat from spinning at higher than normal rpms for long periods.
Might be better off writing down the "China miles" listed on your odometer and keeping track with that. As someone I think has pointed out, the speedometer from the factory tends to read MPH (kind of) and the odometer tends to measure "China miles" (KM).
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2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene" |
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02-10-2022, 09:06 AM | #8 |
Join Date: Jun 2020
Location: A small country with a funny name
Posts: 164
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Well, even if we let slide the fact that he cluster in question seems to use a magnetic sensor... the 1800-2400 rpm that a regular drill puts out seems to be in the normal input range for a traditional Yamaha XT-style speedo. The worm gear + pinion at the wheel act as a rpm multiplier. A typical 18" front wheel with a 100/90 profile tire spins at about 500 rpm @ 60 km/h, so even with a conservative 2-3 multiplication we're well within the few thousands rpm range.
You certainly don't want to try attaching it a dremel-type tool though, those can idle at 10k+ rpm at the lowest setting, and up to 30k rpm at the maximum. |
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02-10-2022, 09:16 AM | #9 | |
Join Date: Oct 2020
Location: Flower Mound Texas
Posts: 904
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Quote:
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2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene" |
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02-10-2022, 01:25 PM | #11 |
Join Date: Oct 2020
Location: Flower Mound Texas
Posts: 904
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Around here about the only time it would be important is during the state inspections. They would catch it if your vehicle had less miles than the previous year's inspection. Lol
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2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene" |
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02-10-2022, 03:43 PM | #12 |
Join Date: Feb 2021
Location: Northeast
Posts: 934
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Less, definitely. I guess for new bikes it’s not much of an issue. But if you have 12K miles it might be a little more difficult. Some states have an “odometer not accurate” provision too.
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02-10-2022, 06:13 PM | #13 |
Join Date: Oct 2013
Location: Boone, NC
Posts: 187
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There's a box to check on the titles in NC to declare that the odo is incorrect. You can't plan to get much money for a used Chinese bike anyway.
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