Speedo reading excessively high

[anthraxnz]

Hi guys,

I have a 98 RG 150. It came with a digital dash system designed for dirt bikes. I didn't like the fact i didn't have all the warning lights so i put the original dash cluster back on. It turns out the previous owner replaced it for a reason...

So when riding at 50km\h the indicated speed is 60km\h, when riding at 100km\h the reading is 120km\h

Is this a simple fix? From what i can gather it could be one of 3 things: 1 the speedo drive, 2 the speedo cable and 3 the speedo itself.

Are there any techniques or info you guys have about diagnosing\resolving this problem?

Thanks.

[george formby]

Got the same issue with G/F's bike. Fitted a bicycle speedo to get the guts on it. Regardless of gearing the wee $40 thing reads accurately.

[nzspokes]

Got the same issue with G/F's bike. Fitted a bicycle speedo to get the guts on it. Regardless of gearing the wee $40 thing reads accurately.

I do the same on my Hornet. Its a great thing.

Only reads up to 199kph but, they expect cyclists to be slow.

[Jantar]

Over reading is very common on many vehicles. Bikes are usually 8 - 10% out and cars are 5 - 8% out. Your error does seem excessive. The cheapest and most accurate solution is to mount a basic GPS on the handlebars.

[slofox]

Have a lookee here...


http://www.healtech-electronics.com/ Click on "speedohealer."

I bought one of these for the gixxer. Works a treat, although they are bike model specific to some extent.

Probably dearer than a GPS though...

[anthraxnz]

Just had a look at the speedo healer. This bike has a cable speedo so that's probably not going to work...

The site does have a cool calculator, turns out mines out by 16.7% lol

Maybe ill find a way to mount the dirt bike speedo thing.

[Big Dog]

Some speedos of the cable to front wheel variety have an adjustment screw inside the housing. Slow process but. You basically need to disassemble turn the white flat screw one way a quarter turn. Assemble. Test. Repeat.


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[Big Dog]

Obviously you void any warranties and will be breaking the law if it now reads too low. Because this will also affect your odometer.


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[anthraxnz]

Obviously you void any warranties and will be breaking the law if it now reads too low. Because this will also affect your odometer.


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Cool, thanks for that! I'll remove it and see what i can find. Yeah i'm not concerned about the warranty lol, 1998 was so long ago... or am i just getting too old?

[FJRider]

Obviously you void any warranties and will be breaking the law if it now reads too low. Because this will also affect your odometer.

For a WOF ... Speedometers need to work. They do not need to be accurate. And there is no legal requirement for speedometers to be tested for accuracy.

However ... it is up to the vehicle operator to not exceed posted speed limits. How they achieve that is up to them.

And ... I have never heard of excessive speeds voiding any warranties either.

[Big Dog]

Wilfully misrepresenting your mileage may not be a warrant issue but is not legal.


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[Big Dog]

Excessive speed will not void a warantee but opening the housing on any instrument may void one.


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[Akzle]

my speedo frequently reads high. A'cours, i usually gofast.

[BoristheBiter]

my speedo frequently reads high. A'cours, i usually gofast.

Just not on a bike (and no your mother doesn't count).

[FJRider]

Excessive speed will not void a warantee but opening the housing on any instrument may void one.

I doubt if the OP's 98 150 is still under warranty ... and if a bike you had was ... getting it fixed under warranty would be the logical (and reasonable) thing to do ...

Having a speedometer that reads incorrectly is not "Willfully" misrepresenting the vehicles mileage ... (unless you wind back the numbers claiming innocence). Any illegality in such matters have more impact on dealers/importers .. rather than on Joe Public.

The odometers often reads (almost) correctly ... even if the speed indicated is NOT ...