Speedometer 5 MPH off!


Information and questions on GL1200 Goldwings (1984-1987)
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rog6785
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Joined: Mon May 09, 2016 9:31 pm
Location: Winthrop, MN 55396
Motorcycle: 1986 Honda Goldwing Aspencade 1200

Speedometer 5 MPH off!

Post by rog6785 »



Does anyone know if there is a way to recalibrate the speedometer. I have a 1986 GL1200 Aspencade and the speedo has been off ever since I bought it. Comparing the speed to my phone I 5 off. When I am going 65 the speedo is saying 60. I replaced the back tire and thought that would help and made not difference. The odometer I have checked that over a five mile stretch with mile marker signs and was right on. So any suggestions? Not a big deal just kind of annoying if someone has a quick fix for this.



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Wilcoy02
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Re: Speedometer 5 MPH off!

Post by Wilcoy02 »

You just need to live with it. There is no fix for this.

rog6785
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Re: Speedometer 5 MPH off!

Post by rog6785 »

thanks that is what I thought.

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tamathumper
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Re: Speedometer 5 MPH off!

Post by tamathumper »

Interesting, the GL1800 is off by 5 mph in the other direction, when the speedo says 65, you're only doing 60.
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AZgl1800
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Re: Speedometer 5 MPH off!

Post by AZgl1800 »

my 1800 is off 6 mph 'fast' at 70 mph by the GPS reading.
I ignore it, been that way since I got it.

My truck speedo reads 3 mph slow, so 60 mph is 63 mph...
none of them are accurate.
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kwthom
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Re: Speedometer 5 MPH off!

Post by kwthom »

Until about 2009, that seemed to be a Honda design 'issue'; the odo and the speedo error couldn't be more closely synched.

There is no federal specifications for odometer error.

Shortly after that class action lawsuit came out over odometer errors, it was miraculously solved.
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hondapotamus
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Re: Speedometer 5 MPH off!

Post by hondapotamus »

My 1800 (2001) was off by about 5 and so I changed the rear tire to a 70 series rather than the 60 series that came stock (about 1" in diameter larger). That larger tire brought it right on spec as verified by my GPS. I don't know if that's an option for you to go to a different tire size.
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rog6785
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Joined: Mon May 09, 2016 9:31 pm
Location: Winthrop, MN 55396
Motorcycle: 1986 Honda Goldwing Aspencade 1200

Re: Speedometer 5 MPH off!

Post by rog6785 »

Thanks for the feedback I will check into that.

Rolfsted
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Re: Speedometer 5 MPH off!

Post by Rolfsted »

I had an 86. I believe the speedometer is driven by a gear on the front rim.

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CrystalPistol
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Re: Speedometer 5 MPH off!

Post by CrystalPistol »

rog6785 wrote:
Thu Sep 10, 2020 9:16 pm
Does anyone know if there is a way to recalibrate the speedometer. I have a 1986 GL1200 Aspencade and the speedo has been off ever since I bought it. Comparing the speed to my phone I 5 off. When I am going 65 the speedo is saying 60. I replaced the back tire and thought that would help and made not difference. The odometer I have checked that over a five mile stretch with mile marker signs and was right on. So any suggestions? Not a big deal just kind of annoying if someone has a quick fix for this.
Back tire has nothing to do with it on a 1200 as the speedometer is taken at front hub. My '85 Aspencade was just about exactly 10% off, reading 55 on the speedometer but 50 on the Kustom Signals Radar I set up on the bike (I attached an antenna pointing straight back on a bracket I fashioned to hold it on the rear rack, the readout was strapped to the faux tank top, I plugged it into an outlet … it was the unit that I was assigned for my job). Was the same at higher or lower speeds, like 44 on the speedometer caused the radar to read 40, 77 on the speedometer caused radar to read 70. I just used a label maker to make a chart.


I extrapolated the 99/90.
It was originally worse with the slightly shorter Dunlop Elite GT front tire, the Elite II was a hair taller and spun slower at speed. I know because my finger was a tight fit between the Elite II and front fender than it was with the Elite GT. The Elite II steered better too.
As I recall, the odometer was spot on over 10 miles on I-81 (10 miles with 1/10th mile markers too) with the Elite GT, but was short a percent with the Elie II. Seems one was a 130/90-16 but the other was a MR90-16.

Told me that Honda intended the error to keep customers licenses safe from unintended speeding tickets by providing a buffer. Bought it in 1995, was on a trip to Ohio for Vintage Days, buddy (my work Sgt.) on his HD said I was going too slow … so I checked when we got back. Sure enough, when I thought we were at the limit he was wondering why I was poking along. :D

Interestingly, my 1500 was off a hair, not as much, and the odometer was off about the same slight amount.


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