Correcting faulty speedo with SpeedoHealer

[vifferman]

It's very, very common for odometers on vehicles (including bikes) to be almost perfectly accurate, and for speedos to be anywhere from 3 to about 8% 'optomistic'. I believe a lot of this is down to the manufacturers ensuring there can't be a lawsuit if someone gets pinged for speeding and can prove the speedo was inaccurate so tries the "I'm innocent! It was the manufacturer's fault!" tack. It also allows for minor variations due to different tyre brands. OTOH, the odometer needs to be fairly accurate for navigational purposes.
My bike was reading about 6% high when I got it, and I lowered the gearing by 1 tooth on the countershaft sprocket, which worked out to about 6%. I was going to see if I could get a friendly policeman to verify the 'corrected' reading, but never had an opportunity to do so. I ended up riding for nearly 3 years with it over-corrected (reading about 2% lower than it should have been). The speedo on my wife's car (when it works) has an error of only 2% against the GPS, which is pretty amazing.

[Morcs]

I put one on my TL. it was bloody marvellous. Keeps the mileage lower too.
Took ten mins to install.

however, on my RR, the installation will take about 2 hours due to pulling the entire bike apart to get to the plug...

[Okey Dokey]

8% is the average for gsxrs (suzukis in general)

Thanks for that; that is exactly what I seem to have.

[gixxer-king]

i bought the Jaycar kit for my nissan first of all (on the box it says nissan kit) and then fitted one to my celica. Now have one on the tl1000r the gsx1300r and even the gv250. works well and easy to adjust. much cheaper but requires a bit of work. im a tight arse so went that avenue. must say its nice knowing that when speedo reads 100 it means 100 no fluffing around at 90 just so the pigs are happy