Does anyone use the SpeedoHealer device? I hear it works well, just not sure if the odometer reading is off after the speed adj. is corrected???

 

The SpeedoHealer only works with electric speedometers. Ours are mechanical.

 

NoBrakes,

Super photography and an excellent contribution. Also very complete. Thanks for submitting your work.

 

Thanks so much for this right up. I knew there had to be a simple way to fix this problem.

** just noticed this thread is over 5 years old!

 

I just add 5 mph when I ride on all bikes. That's easier. LOL

 

Great write up, but doesn't it give to low a reading now at low speeds?

At least now I know how to set my odometer back now before I put my bike up for sale. (just kidding)

 

Nice write up NoBrakes!

Another method I have used is simply to pry the needle off of the metal pin completely using two spoons so that pressure is applied to the needle evenly, and in a controlled manner. That way you reduce the risk of damage to the mechanism...

 

ive done this mod on a scooter
I dont remember it having that large aluminum thing all I did was bend the spring somehow and it changed the needle position too

did it 2 times the last time was because the front tire was larger then stock
so just had to fine tune it again
was dead on with my gps too

 

Fair question, I'll have to check that out

 

Rotating the needle on the post will simply offset the reading, rather than changing the 'scale' of the reading. My speedo is about 10% off, all the way up and down the range.

Let's play a little math. Let's say the reading is 10% low: Indicated = Actual * 0.9
If you rotate the needle such that it adds say, 5mph: Indicated = Actual * 0.9 + 5

Given this, the indicated speed will be correct at one particular speed... a little simple algebra.
Set the Indicated=Actual...
Actual = Actual *0.9 + 5.
Actual(1-0.9) = 5.
Actual = 50mph.

At all speeds away from 50, the indicated speed have a progressively greater error. Given that we are probably most concerned with knowing the speed when in a fairly narrow range of speeds, and trying to avoid a ticket, this sort of error is probably OK.

If you want to have the speed accurate from 0 to 100 (yeah, right), then you need to do a proportional correction to the speedo, which might well involve changing the spring tension.