MOCO Fails
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Elite HDF Member
Joined: May 2012
Posts: 3,910
Likes: 2
From: Nebraska
It didn't even click the speedo being off would effect the odometer. Thought they would be two separate things, one measures speed, one measures distance. So if it's only off by 1mph at 30 and under then the odometer won't be off as much? It doesn't make sense.
The added miles do **** me off whether they effect the value or not. And the fact that the MOCO doesn't care just adds to it. Ranting about it isn't going to change anything but Harley's response was freaking lame.
The added miles do **** me off whether they effect the value or not. And the fact that the MOCO doesn't care just adds to it. Ranting about it isn't going to change anything but Harley's response was freaking lame.
Seasoned HDF Member
Joined: Apr 2009
Posts: 44,851
Likes: 29,829
From: PNW
If this is your biggest problem in life, you're doing great.
Mine was off on my Dyna for a little while at almost 40%. I noticed it really quick, and before I got a chance to investigate, my speed sensor failed. Replaced the speed sensor and it started reading right again. Check it for debris.
Club Member
Joined: Jul 2014
Posts: 11,468
Likes: 3,572
From: Idaho
The reason the MoCo isn't doing anything is not because they're "lame", it's because your bike is normal.
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Outstanding HDF Member
Joined: Sep 2006
Posts: 2,945
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From: Florida
For what it is worth:
I've posted here before about the speedometer/odometer readings.
On IBA rides I run a GPS in tandem with the bike odometer and log both my GPS mileage and HD odometer mileage.
I've documented thousands and thousands of miles of the 2 running simultaneously.
The GPS is mounted over the speedometer on the bike.
I always use my GPS to determine my speed too because I don't want to give up a few MPH over a 1,000 mile run. (speed is time)
Here is what the data shows:
As you discovered the speedometers are off.
Mathematically, I could never hit the exact percentage from run to run, it seemed to vary and that didn't make sense.
The variable turned out to be the make of tire and newness of the tire can cause the speedometer to be off as much as the speedometer itself. Some makes of tires are slightly smaller in diameter and all tires get smaller in diameter as they wear down.
In a long ago post I did the math on the reduction of the circumference of the tire and reduction of forward travel per revolution compounded over thousands of miles and realized it had about as much impact on the odometer reading as the factory setting of the odometer.
Go log your car odometer readings and GPS readings over a thousand miles and you will see your car is off too.
The bottom line is even with perfect conditions and a calibrated odometer, the miles logged on your odometer are imperfect due to tire size and wear.
A previous poster put it in perspective, 95,000 miles on the bike or 100,000? Who cares...
I've posted here before about the speedometer/odometer readings.
On IBA rides I run a GPS in tandem with the bike odometer and log both my GPS mileage and HD odometer mileage.
I've documented thousands and thousands of miles of the 2 running simultaneously.
The GPS is mounted over the speedometer on the bike.
I always use my GPS to determine my speed too because I don't want to give up a few MPH over a 1,000 mile run. (speed is time)
Here is what the data shows:
As you discovered the speedometers are off.
Mathematically, I could never hit the exact percentage from run to run, it seemed to vary and that didn't make sense.
The variable turned out to be the make of tire and newness of the tire can cause the speedometer to be off as much as the speedometer itself. Some makes of tires are slightly smaller in diameter and all tires get smaller in diameter as they wear down.
In a long ago post I did the math on the reduction of the circumference of the tire and reduction of forward travel per revolution compounded over thousands of miles and realized it had about as much impact on the odometer reading as the factory setting of the odometer.
Go log your car odometer readings and GPS readings over a thousand miles and you will see your car is off too.
The bottom line is even with perfect conditions and a calibrated odometer, the miles logged on your odometer are imperfect due to tire size and wear.
A previous poster put it in perspective, 95,000 miles on the bike or 100,000? Who cares...
Last edited by Jonesee; Sep 8, 2014 at 06:50 PM.
Outstanding HDF Member
Joined: Aug 2010
Posts: 3,498
Likes: 128
Consider that a GPS can be off by as much as 30 feet for each reading it takes and a GPS does not measure a smooth track. It plots points. If you travel around a curve or bend, it does not calculate a smooth curve. It moves from point to point around the curve and has it's own built in inaccuracy. The only time it is accurate is when it is plotting a straight line and even then it can be slightly off.