speedometer is off by 5 MPH at 60 - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 24 (permalink) Old 05-25-2014, 10:56 PM Thread Starter
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Question speedometer is off by 5 MPH at 60

so, the title pretty well speaks for itself...

when the speedo says 60, im only doing 55. when the speedo says 40, im only doing 38 (according to the signs they put on the sides of the road). the question I have here is this: how can I fix this? the tire is the proper size (I thought that it may be a smaller circumference which would make the speedo off etc, but it is the correct size) since its all electronic etc, I have no clue how to fix the speedo... any ideas?

1999 V-Star 1100 Custom with driver backrest, all studded leather (seats, bags, backrests, etc), hole saw exhaust mod (1-7/8" hole bit), windshield, MaxAir Engineering air intake (pod filters with crossover), Jet kit with predator needles (145 and 142.5 main jets and 117.5 pilots), fuel/air mixture thumb screws, Linby Linbar highway bar
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post #2 of 24 (permalink) Old 05-25-2014, 11:37 PM
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That's normal for many motorcycles.

I've always heard good thing about SpeedoHealers. According to their website they have a setup that works with the 1100s...Kind of pricey, at least $120, but those 2-5 mph may be worth it to you

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post #3 of 24 (permalink) Old 05-25-2014, 11:45 PM Thread Starter
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I don't think im willing to put over 100 bucks into that issue... not when I know its off pretty consistantly

1999 V-Star 1100 Custom with driver backrest, all studded leather (seats, bags, backrests, etc), hole saw exhaust mod (1-7/8" hole bit), windshield, MaxAir Engineering air intake (pod filters with crossover), Jet kit with predator needles (145 and 142.5 main jets and 117.5 pilots), fuel/air mixture thumb screws, Linby Linbar highway bar
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post #4 of 24 (permalink) Old 05-26-2014, 04:15 AM
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there are alternatives to correct it for about $40. google "motorcycle speedo correction"

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post #5 of 24 (permalink) Old 05-26-2014, 09:08 PM
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I make a mental note of the difference, and compensate accordingly, or rely on my GPS. I will only break that out when I am hopelessly lost or absolutely need to be on time going to a new location.

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post #6 of 24 (permalink) Old 05-26-2014, 09:25 PM Thread Starter
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after checking them out, I think i'll just stick with remembering that it's off by 5 mph. I usually run about 5 over anyway, so no big deal either way. I like the thought of the new speedo face, but not thrilled with actually installing it lol

1999 V-Star 1100 Custom with driver backrest, all studded leather (seats, bags, backrests, etc), hole saw exhaust mod (1-7/8" hole bit), windshield, MaxAir Engineering air intake (pod filters with crossover), Jet kit with predator needles (145 and 142.5 main jets and 117.5 pilots), fuel/air mixture thumb screws, Linby Linbar highway bar
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post #7 of 24 (permalink) Old 05-26-2014, 10:53 PM
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Turns out this is pretty common with the 950 series. My 2013 is off by 10% and so is my buddy's 2011. Sure you can compensate for it but what bothers me the most is it's adding miles to the odometer that the bike isn't travelling. And yes, I've checked this against other bikes to verify.
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post #8 of 24 (permalink) Old 05-27-2014, 05:14 AM
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My 2009 950T is about 5 MPH lower at 55 MPH radar. So does that mean that I am clocking less miles???
I just take it as s comfort zone when I am doing about 5 MPH over the posted I am actually spot on. (;-)

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post #9 of 24 (permalink) Old 05-27-2014, 08:03 AM
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First thing I would do is take it somewhere and have it calibrated. You need to know exactly where it is before you go making changes and adjustments.
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post #10 of 24 (permalink) Old 05-27-2014, 09:33 AM
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A few years ago I did a comparison between my bike's speedometer and my GPS. I found that the error was progressive. With the following being GPS speeds: At 30 mph the bike showed less than 1 mph high. At 45 it was slightly over one mph high. At 55 mph it was 2 mph high. At 65 it was 3 mph high and at 75 it was four mph high. I just mentally take it as a margin for keeping myself out of trouble with the law.

For what it's worth, the speedometers in my pickup, car and motorhome also read slightly higher than my GPS speed.

I've validated these findings using several GPS receivers.

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