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Speedo error #145316 05/16/19 09:07 PM
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spooky Offline OP
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2017 XT250 with digital speedo.
My GPS shows between 4 and 5 MPH difference. (GPS reads higher than the XT speedo.)
Is this normal for the XT's?


Back roads explorer, Designer, Innovator & all-a-round messer-upper. My XT250 Web Page
http://www.powers31.info/2017_xt250.htm

Re: Speedo error [Re: spooky] #145322 05/16/19 09:27 PM
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#brer15 Offline
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I thought on the 225's that the indicated was faster that actual.


2004 XT225 purchased new in October 2004 0 miles. Current miles over 27,000.
Re: Speedo error [Re: #brer15] #145326 05/17/19 03:07 PM
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Az4x4 Offline
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On the XT225s I've had indicated speed was a bit faster than actual speed, at least from 50 mph and up..


..FAILURE is not the opposite of SUCCESS, it's part of what makes SUCCESS..
Re: Speedo error [Re: spooky] #145331 05/17/19 06:57 PM
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peejman Offline
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Mine was 2-3 mph different (the width of the needle) from 10-70 mph.

Yes, the speedo indicating slightly less than actual speed is normal. Motorcycle OEM's recognize the variety of tires available and how different the sizes can be. The speedo is set conservatively for that reason.


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: Speedo error [Re: #brer15] #145337 05/18/19 01:43 AM
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spooky Offline OP
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Originally Posted By: #brer15
I thought on the 225's that the indicated was faster that actual.

Originally Posted By: Az4x4

On the XT225s I've had indicated speed was a bit faster than actual speed, at least from 50 mph and up..


Mine is a XT250.
My error is more than any of my previous bikes have been.
They have been 1 - 3 mph typ. This seems excessive at 4 - 5 mph.
BTW: The bike has OEM tires, and only 1500 miles on it. Almost no ware at all.

Last edited by spooky; 05/18/19 01:48 AM.

Back roads explorer, Designer, Innovator & all-a-round messer-upper. My XT250 Web Page
http://www.powers31.info/2017_xt250.htm

Re: Speedo error [Re: spooky] #145342 05/18/19 02:46 PM
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Craig1 Offline
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I bought a new 2009 KLX250 and the speedometer reading was 10% high.
To make the speedometer accurate,I bought a Speedo calibrator from 12 O'clocklabs and it worked great. After installing it, I forgot it was there. Never had to mess with it or re-calibrate it in the 2 years I owned the bike.
They make a plug and play unit that fit the KLX250. I don't see the XT250 listed, which means you would need to get the universal unit and do some wire splicing. I would contact them to see what is required for your bike.

http://shop.12oclocklabs.com/index.php?route=product/product&product_id=59


Craig
Re: Speedo error [Re: Craig1] #145346 05/18/19 03:31 PM
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Az4x4 Offline
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Originally Posted By: Craig1
..I bought a new 2009 KLX250 and the speedometer reading was 10% high. To make the speedometer accurate,I bought a Speedo calibrator from 12 O'clocklabs and it worked great..

Never went fast enough to worry about whether indicated speed on my XT225s was fully accurate. But your experience with your KLX250 reminds me of calibrating the speedometer on my Cummins 5.9 diesel Ram 2500 truck - which I used the performance tuner accessory I got with the truck to do. Reset the speedo from a good 5mph slow to spot on electronically, and worked a charm! Clever gadgets these, to say the least..


..FAILURE is not the opposite of SUCCESS, it's part of what makes SUCCESS..
Re: Speedo error [Re: spooky] #145351 05/19/19 04:53 AM
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patuca Offline
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On one of my favourite trail rides it's common to see my garmin gps trip computer display a heavy (+20%) error in certain areas. Plotting the track on my mapping program (GPS Trackmaker) shows a more accurate speed but there is always some positive error.

Tracking this down I read an explanation something like this:

On the screen a GPS receiver displays the "EPE" or the "expected positional error" and even under perfect conditions this is error is sometimes 10 feet or even more for each point on a track.

That means the gps is tracking the motion not as a straight line, but as a series of jogs from point to point which makes the distance appear longer and thus the speed is instantaneously presented as a faster speed.

GPS receivers have a built in algorithm that averages the jogs when the track is saved or plotted, but just reading the active track data might not be accurate.

The error is minimized with good satellite geometry, clear view and many locked up satellites...and a straight course, but it's common for there to be a slight positive error.

I think you can minimize the problem by using the gps to set a measured mile and timing a run rather than noting the gps reading.

guesses...

patuca


"this will only take a second..."
Re: Speedo error [Re: patuca] #145352 05/19/19 11:38 AM
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spooky Offline OP
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Originally Posted By: patuca
On one of my favourite trail rides it's common to see my garmin gps trip computer display a heavy (+20%) error in certain areas. Plotting the track on my mapping program (GPS Trackmaker) shows a more accurate speed but there is always some positive error.

Tracking this down I read an explanation something like this:

On the screen a GPS receiver displays the "EPE" or the "expected positional error" and even under perfect conditions this is error is sometimes 10 feet or even more for each point on a track.

That means the gps is tracking the motion not as a straight line, but as a series of jogs from point to point which makes the distance appear longer and thus the speed is instantaneously presented as a faster speed.

GPS receivers have a built in algorithm that averages the jogs when the track is saved or plotted, but just reading the active track data might not be accurate.

The error is minimized with good satellite geometry, clear view and many locked up satellites...and a straight course, but it's common for there to be a slight positive error.

I think you can minimize the problem by using the gps to set a measured mile and timing a run rather than noting the gps reading.

guesses...

patuca






Very interesting. Common conception is that a GPS is a more accurate reference for speed readout. This dispels that theory.
My son has a TW200, and noticed a similar discrepancy in that bike too. Makes me wonder if Yamaha speedo's are set different than other jap bikes.


Back roads explorer, Designer, Innovator & all-a-round messer-upper. My XT250 Web Page
http://www.powers31.info/2017_xt250.htm

Re: Speedo error [Re: spooky] #145354 05/19/19 09:56 PM
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Craig1 Offline
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I find GPS to be very accurate on flat straight roads. Don't trust GPS on hilly/curvy roads.
When in doubt, find a highway with mileage markers. Hold indicated speed steady at 60mph. hit the lap button on a stop watch each mile for a few miles. calculate your actual speed.

FYI. My 92 XT225 indicates 60mph at an actual 55mph.


Craig
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