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Discussion Starter #1
My speedometer was reading 81 mph when all other riders were cruising at 74mph... big friggin difference....... Any info on this, anyone else having this problem??
 

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Everyone's opinion of how far the speedo is off varies. Most bikes have speedo error built in. Many differeing opinions as to why. Don't see any reason why they should, so it must be intentional.

I always just figure I am going 5 MPH slower than the speedo reads and figure I'm pretty close.

There are aftermarket devices (yellow box is one name I know of) that will correct it... but I figure once you get used to it, it isn't a big deal...
 

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All the speedos on the 1800's are off, but not that bad. They will usually register about 5 mph too high across the board!
 

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There are a couple of ways to correct this.

Take a look at "yellow box" at http://www.blackrobotics.com/
with installation photos at
www.pbase.com/fredharmon/yellowbox

There's at least one other electronic box to correct the problem, but I
can't find my link to it's web page.

As I recall, the big question is whether or not the recalibration can be done "on the fly" (like with a knob) or requires more fiddling.
Fred's use of "yellow box" was a pretty good recommendation for me.
 

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my is 5 % off which is a lot different then 5 MPH off. Which means in a 25 mph zone, if you go 5 mph over, you are speeding. Once you reach the speed of 60 to 70 mph then 5 mph over will work. So be careful and what and when you add 5 mph.

Dan L
 

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when ever i drive a new vehicle i check the speedo right away, keeps my driving record clean that way

mine is 4 % high

so if it reads 70, i am at 67 actual

thats pretty close, so i guess i am fairly lucky.

i cruise down the interstate and compare the numbers of the mile markers to the speedo trip numbers, for a ball park figure. if it ever gets nice out again, ill try the gps for results.

loren
 

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The following are from various issues of Motorcycle Consumer News, these are the actual speeds when the speedometer reads 65 mph.

All at indicated 65 mph

2004 Ducati Multistrada--60.9
2003 Kawasaki ZR1000-A1--59.5
2003 Suzuki SV1000S--59.4
2003 Kawasaki 1600 Classic--59.3
2003 Suzuki SV650S--61.2
2003 Honda ST1300--61.5
2003 Ducati 999--61.92
2003 BMW R1200CLC--60.2
2002 BMW R1150RS--61.0
2002 Kawasaki ZX-9R--61.0
2002 Yamaha YZF-R1--60.2
2002 Honda GL1800--61.5<<<<<<<<<<<
 

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Slow down, you are going too fast!

Well, with a GL1800, you are really going too slow. About 6%-7% too slow. The example speeds that your message showed is about the same as all of us.

If you want to save some time for yourself and others on this subject, go to: http://www.gl1800riders.com/forums/view ... ght=speedo

There are lots of posts on the above referenced thread that will help you understand the variance and see some solutions.

(just in case there is a limit to the amount of internet ink)
 

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speedo error

I agree with most of the comments. My speedo is fast about 4mph, so I just do the compensation in my mind and there is never a problem. I would rather have it fast then slow.

Wish this snow and ice would leave the area so I could test the "speedo" error again.
 

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Discussion Starter #10
Thanks

I appreciate all the info

Loren, did you get my message? I would like to see a photo of your Pacific Coast
 

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I took care of the speedo error by putting an oversize Metzler on the rear. Corrected it to dead on; when I had gone 100 miles, the odometer would read 98 miles. I did notice some handling differences and when I popped the rear tire with a nail, I went back to the standard size.
 

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I installed the correction box offered by jim ahlaman. It is now dead on based on my GPS. It is plug and play-no splicing. I had the dealer plug in in when the reweld was done. Good Luck, Glenn
 

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speedo

I was thinking of getting mine checked the same way. Did you have him check it at different speeds? If so, was it consistently over by 5mph?
 

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Mine is the same way. Shows 75 actually going about 68. I have an appointment to get it fixed at the dealer......we will see.
 
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