My speedo shows way too fast! - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 26 (permalink) Old 05-18-2017, 08:44 PM Thread Starter
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My speedo shows way too fast!

My speedo on 2016 FJR is showing about 6 - 9KPH too fast. Faster I go the higher the difference. I checked this against my GPS on a ride yesterday.

First question - is speed shown on a GPS accurate?
Second question - if it is indeed too fast, is there a simple way to correct it?

Steve.

2016 FJR1300A
2012 Honda Goldwing Triked
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2008 Yamaha V Star 1300
1982 Honda 750 V4 Sabre
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post #2 of 26 (permalink) Old 05-19-2017, 04:47 AM
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Originally Posted by Golden Dakota View Post
My speedo on 2016 FJR is showing about 6 - 9KPH too fast. Faster I go the higher the difference. I checked this against my GPS on a ride yesterday.

First question - is speed shown on a GPS accurate?
Second question - if it is indeed too fast, is there a simple way to correct it?

Steve.
Hi Steve,
Unfortunately displayed speed on canadian gen 3 is about 8 or 9 % too high. When I have my GPS I look my speed there, otherwise I mentally substract 10% from my displayed speed.
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post #3 of 26 (permalink) Old 05-19-2017, 07:06 AM
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So how does one re-calibrate the speedo? What if tire size/diameter were changed any method to compensate for that?

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post #4 of 26 (permalink) Old 05-19-2017, 07:19 AM
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So how does one re-calibrate the speedo? What if tire size/diameter were changed any method to compensate for that?
You could run a larger rear tire to compensate. A lot of folks run a 190 rear.

My speedometer on my 2013 is only off a couple of mph at highway speeds. At an indicated 82 mph, my GPS is usually on 80.

I have found it bizarre that the percentage of error is larger when displaying in KPH rather than MPH. It would seem the speed would be calculated exactly the same way on all 2015s and just display the way we ask it to.

Just keepin' up with traffic, Officer.

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post #5 of 26 (permalink) Old 05-19-2017, 07:21 AM
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Golden, all of my Japanese vehicles run 2-3mph fast, must be a cultural thing to protect us from ourselves, but my honda's, toyota's, subaru's and of course the yammyhaw all show 2-3mph fast at about 60-70mph and as you noted most gain the faster you go. Now as far as the gps accuracy goes good luck with that, a while ago we had a top speed thread where the gps was considered accurate but after contacting garmin and Tom-Tom and getting the mealy mouthed corporate legal no answer response from both I wouldn't bet on their accuracy. But I'll say that checking a couple vehicles with 2 different garmins and a Tom-Tom that all agree I feel more confident that they are more accurate than the speedo is.

Steve P
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post #6 of 26 (permalink) Old 05-19-2017, 10:09 AM
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I always assumed manufacturers purposely added the error so they could not be sued by consumers for tickets they received. Manufacturers limiting their liability. If there is a +/- tolerance, it would be better to start with an indication above the actual speed so that it would never show less than the actual speed. I have no idea where I got this belief. Just one of those ideas that i grasped onto and still hold for whatever reason. My Roadtec 01's are closer to matching my GPS speed than the original Battlax's, so tires make a difference. And I have no idea how to calibrate the speedo.

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post #7 of 26 (permalink) Old 05-19-2017, 10:35 AM
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I always assumed manufacturers purposely added the error so they could not be sued by consumers for tickets they received. Manufacturers limiting their liability. If there is a +/- tolerance, it would be better to start with an indication above the actual speed so that it would never show less than the actual speed. I have no idea where I got this belief. Just one of those ideas that i grasped onto and still hold for whatever reason. My Roadtec 01's are closer to matching my GPS speed than the original Battlax's, so tires make a difference. And I have no idea how to calibrate the speedo.
I feel the same way. Everything a business does now has to be done with an eye toward potential liability. Thus we have warnings about coffee being hot, don't use electric hair dryers in the shower, don't take medications intended for prostate health if you're pregnant, .....
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Just keepin' up with traffic, Officer.

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post #8 of 26 (permalink) Old 05-19-2017, 10:56 AM
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There is a device called a SpeedoHealer that will correct the speedometer. One was on my 2012 Super Tenere when I got it and it made the speedo read identical to my GPS. It also makes the odometer become inaccurate by as much as 6% in my case. I took it off because I wanted my odo to be accurate and I always run with a GPS. My Tenere indicates 75 at a true 70 and 86 at a true 80.

My Speedo Healer was installed by a Yamaha mechanic and it required cutting an ECU wire to solder the device in. I've heard the newer SpeedoHealers are plug and play on at least some bikes.

With 1 180 tire on my FJR the speedo reads 82 at a true 80. When I run a car tire the speedo and GPS read the same.
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post #9 of 26 (permalink) Old 05-19-2017, 11:47 AM Thread Starter
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Kevin - do you know what the effect the SpeedoHealer has on the odometer? Does it cause the odometer to show that the bike has done more miles than it really has, or less miles? And how much difference?
Thanks.

2016 FJR1300A
2012 Honda Goldwing Triked
2012 Honda Goldwing
2011 Kawasaki Vulcan
2008 Yamaha V Star 1300
1982 Honda 750 V4 Sabre
1965 Honda 90 Sport
1963 Honda 50 Sport
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post #10 of 26 (permalink) Old 05-19-2017, 12:27 PM
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If the mileage calculations are as inaccurate as the speedo, then your MPG's off by just as much, therefore making your bike look not only faster, but getting better mileage to boot. A win-win for Yamaha.

Robin
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