Inaccurate speedos in Canada - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 42 (permalink) Old 06-30-2019, 11:00 AM Thread Starter
DGH
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Inaccurate speedos in Canada

2nd FJR. First was an 06 second 2014. Both had stock size tires. Current one bought late October with 3000km, now has 9000km. Both show 100kph. on speedo, actual speed is 94. Is this common and if so, why?
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post #2 of 42 (permalink) Old 06-30-2019, 11:33 AM
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Common problem to most motorcycles here, 7% error on an FJR. A little up or down on that for other bikes. Compensation for what kind of tire you might install one day? A bit much overcompensation IMHO......

A car tire will fix you up and get really close, maybe 1% error. A 190/55 rear tire will get you more like 5%. Mostly fergedaboudit, read the speed on your GPS instead, it's not perfect but darn near.


If you want to spend money, get a SpeedoHealer, you can vary the algorithm to get near perfect. I don't recommend that on a Gen3, since you have to buy two of them, one for the front and one for the rear... can mess up the cruise engagement or restrict it (as we found out on a buddy's 2016). Save yer money for a GPS.
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post #3 of 42 (permalink) Old 07-03-2019, 12:31 PM
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2015A Cruise set at 100 mph and gps shows 97 mph. Close enuf for me to go to jail.
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post #4 of 42 (permalink) Old 07-03-2019, 02:11 PM
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same here...at about 108km/h indicated I'm showing 100 km/h on my GPS.
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post #5 of 42 (permalink) Old 07-04-2019, 09:15 AM
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Honda (at least used to be) about 10% low from actual speed. The faster you were going the larger the delta. Mfgrs calibrate their speedos low to avoid class action lawsuits from a block of owners getting speeding tickets if they aimed for the bullseye and missed high.

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post #6 of 42 (permalink) Old 07-04-2019, 12:01 PM
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post #7 of 42 (permalink) Old 07-04-2019, 12:23 PM
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The large error on Canadian bikes is a function of Canadian bikes. The speedo error on a US spec FJR is pretty low. At an indicated 30 mph, mine is 0 to 1 mph low. At 70 mph, it is 1 to 2 mph low according to my GPS. I didn't check at 100 and 120 mph.
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post #8 of 42 (permalink) Old 07-04-2019, 06:12 PM
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Both my Super Tenere and my FJR are out about 8%. 100kph actual is 108 indicated, 110 actual is 119 indicated, 120 is 130 indicated etc. I pretty much just ignore it and use my GPS app on my phone. I also have my speed displayed on my TomTom.
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post #9 of 42 (permalink) Old 07-05-2019, 08:33 AM
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Here in europe it is law that the speedo must show x% (I think it is min 2%) more then what you are riding so you are sure that you are not breaking the speed limit when following the speedo.
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post #10 of 42 (permalink) Old 08-09-2019, 12:03 AM
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Yes my '17 ES is also reading 108kph and gps app reading 100kph.
Question: "due to this discrepancy, am I to assume that my (trip & total bike mileage) odometer is reporting a total of 8% more kilometers then the bike actually traveled?"
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