speedometer off by 10km/h?

C

cpgop

Member
Hi every one, I have a quick question/problem

I have a 50cc scooter, and for some reason, I think my speedometer is off by 10km/h, as when I had a gps on my scooter, it showed 10 under what the speedometer was showing, im wondering if maybe my speedometer calibration is off? is there anyway to find out if it is, and if it is repair it?

-Regards
Greg(cpgop)
 
So when stopped it says 10 km/h? *I kid* It is likely off by a certain percent and not a fixed km/h. It might not be linear either, mine is pretty close to GPS at 70, but WAY off at 140. Etc.
 
I see, because I've tryed to watch it when I take off(kinda hard with cars infront of me hehe) it normaly sits on 0 for around 5/10 sec after takeoff, and im normally going the same speed as the car infront of me. I've actually debated asking a cop to radar me, I didnt think would go over to well..
 
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depending on how your scooter's speedo-pick it setup, you might be able to tweek the system to get a better/accurate speed reading....

all depends on the scooter and how the speedo is setup
 
Almost every speedometer reads higher than your actual speed (10% is not uncommon). Some bikes can be fixed with no additional hardware (at least some BMW's that I know of), others can use a speedohealer to fix the speedometer.

Personally I just do the math in my head and save the money on the speedohealer.
 
You can always compare your indicated speed to that of a GPS that you carry with you, if you have access to one. That should be fairly accurate and will help confirm if your speedo is off. If you can't find a way to recalibrate the speedo, an alternative is to rig up a bicycle computer to your scooter (if accurate speed indication is such a concern). Mount the pickup on the front fork, rare earth magnet on one of the brake rotor bolts and route the wiring up to the handlebars for the computer cradle. The bicycle computer is programmable, allowing you to accurately calibrate it to the GPS indication.
 
my bike is off by 10% but the odometer is 100% correct. I'd think twice before trying to fix it since your odometer will be off.
 
There's not a manufacturer who would put a speedo out which would not be optimistic anywhere between 2-10%. Can you imagine the legal consequences for them if it didn't?
 
Splash said:
my bike is off by 10% but the odometer is 100% correct. I'd think twice before trying to fix it since your odometer will be off.
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So your nike has 2 different sensors? One for the speedo and one for the odometer?
 
^^ No. The manufacturer has built in the error into the speedo but the odometer is reading correctly.

For OEM bikes i know they most read high so i compensate for it in my head. Once you start playing with gearing then i'd seriously consider a speedoDRD or speedohealer (if your bike is supported) because than the speedo is gonna be really out of whack!
 
jeffjones said:
So your nike has 2 different sensors? One for the speedo and one for the odometer?
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My Adidas has only one sensor, like RedLiner740 said, the OEM compensated for it.
 
Red_Liner740 said:
For OEM bikes i know they most read high so i compensate for it in my head. Once you start playing with gearing then i'd seriously consider a speedoDRD or speedohealer (if your bike is supported) because than the speedo is gonna be really out of whack!
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Unless you have an older bike with a speedo pick up off the front wheel. You can change gearing as much you want .... and still get a correct speed LOL (the love for old bikes dies hard)
 
Red_Liner740 said:
^^ No. The manufacturer has built in the error into the speedo but the odometer is reading correctly.

For OEM bikes i know they most read high so i compensate for it in my head. Once you start playing with gearing then i'd seriously consider a speedoDRD or speedohealer (if your bike is supported) because than the speedo is gonna be really out of whack!
Click to expand...

So what happens when you use a speedohealer and change your gearing and correct for both OEM variances and sprocket change?
You will be getting 100% on speedo, so will your odometer be off then?
 
Splash said:
my bike is off by 10% but the odometer is 100% correct. I'd think twice before trying to fix it since your odometer will be off.
Click to expand...

+1
My bike has a speedohealer, but the odo is reading slow. It took me 1yr to figure that out. I used to wonder why my gas mileage was that bad.
Splash said:
My Adidas has only one sensor, like RedLiner740 said, the OEM compensated for it.
Click to expand...

:lmao:
Jokes
 
On a bike with an analog speedometer, wouldn't it be pretty easy to manufacture a new backing for the speedo that just repositions the notches and numbers to be accurate?
 
bombshelter13 said:
On a bike with an analog speedometer, wouldn't it be pretty easy to manufacture a new backing for the speedo that just repositions the notches and numbers to be accurate?
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You talkin bout manufacturing a new replacent faceplate for the speedo, behind the needle!

That could work, not sure about it being easy though.
 
Doesn't seem so hard to me, something like this?

1. Put on your GPS speedo and go out riding.
2. Check what reading you get on your normal speedo when your GPS speedo reads 20 km/h, remember it.
3. Repeat for 30km/h, 40km/h, up to whatever speed you normally actually drive the bike (probably no need to deal with 200+ if you're not speeding like crazy/tracking the bike).
4. Yank out existing speedo backing, scan it.
5. In a graphics program, take scanned image and adjust lay out of numbers to match the readings you got in step 2.
6. Get a sheet of plastic, cut it into correct circular shape.
7. Print out new image, laminate it to the piece of plastic.
8. Stick the new backing in your speedometer.

Shouldn't this work?
 
My GPS shows that my 2010 GS500F is off by 10%,actual speed is slower that what is shown on the speedometer.
But the odometer is accurate.
 
bombshelter13 said:
Doesn't seem so hard to me, something like this?

1. Put on your GPS speedo and go out riding.
2. Check what reading you get on your normal speedo when your GPS speedo reads 20 km/h, remember it.
3. Repeat for 30km/h, 40km/h, up to whatever speed you normally actually drive the bike (probably no need to deal with 200+ if you're not speeding like crazy/tracking the bike).
4. Yank out existing speedo backing, scan it.
5. In a graphics program, take scanned image and adjust lay out of numbers to match the readings you got in step 2.
6. Get a sheet of plastic, cut it into correct circular shape.
7. Print out new image, laminate it to the piece of plastic.
8. Stick the new backing in your speedometer.

Shouldn't this work?
Click to expand...

Not if your speedo is digital ;). More bike manufacturers seem to be moving toward digital speedos with standard tachs from what I've been seeing lately.
 
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