speedo

[firestormcrazy]

help!!! i ve ran out of ideas and need some advice. When the speedo reads 30mph im only doing 25 and its doing my nut in. I have changed the speedo drive and the clocks and checked all the connectors and everything is ok but its still doing it any ideas, cheers

[firestormcrazy]

i ve heard about them not too sure about what or how it works tho, i was wanting to see if there was any underlying problem that could be solved before buying that.

[Beamish]

Warby has one also if my memory serves me correctly, seem to remember a top speed of 160mph stored in it

[firestormcrazy]

thanks guys have already pm LotusSevenMan and will see what he says hopefully might get this sorted out. btw it looks like somebody beat me to those cans

[warby221]

Is the 25mph a real speed or is that what’s showing on some one else’s Speedo??
If its real speed say read off a sat-nav remember there’s always a in built error of around 10% and that’s usually on the optimistic side so you don’t inadvertently end up speeding so at 30mph on the clock the real speed would be 27 ish so 25mph is a bit under but not a lot

If your speeds been picked up of some one else’s Speedo then I would say that the gearing has probably been lowered with either a 15 tooth front sprocket or a 43tooth back in that case you would need a Speedo healer or revert back to standard gearing to correct the speedo

Fitting a Speedo healer is easy and programming them is a doddle as long as you follow the instructions word for word

Warby has one also if my memory serves me correctly, seem to remember a top speed of 160mph stored in it

Me never
I’m a law abiding citizen with no interest in braking the speed limit jim

[pariah]

I would have thought that it would have been a problem with a speed sensor some where that was casuing the fasle reading.

[firestormcrazy]

hi guys, thanks for the info, when i say im only doing 25 its off my mates speedo and the sprockets are 100% standard, 1st thing i checked, and i ve also replaced the speedo drive.

[warby221]

Have to have a think on this one
But first thing are you positive your m8 Speedo is correct it could be his that’s out maybe check with a GPS/sat nav and check it at different speeds to it may be reading right at a higher speed

Don’t assume that a replacement part is working ok I spent hours one time on a car trying to get it to run right and it turned out I’d replaced a duff condenser with a new duff condenser


The Speedo works on the same principal as the tacho
The Speedo drive picks up a signal from a magnet/s on the output shaft in the gearbox then sends the signal to the Speedo say how many revolutions of the shaft then the Speedo displays the information as mph
Not a lot to go slightly wrong more likely not to work at all than anything else

There is a way of recalibrating the Speedo but I don’t know how it’s done “never had to do one myself” so probably have 2 go to a specialist and that’s going to cost
A speedo healer is about £65 and can be reset if you change ratios

[bikerpiker]

What about those road signs that flash your speed up on display on roadside when approaching villages,schools etc
I wonder how accurate they are ,i know when i approach the sign in a nearby village it displays 26mph when my car speedo is sayin 30mph
Most likely the signs will be accurate ,wondered if there were any local to you

stevie

[firestormcrazy]

dnt have access to a gps thingy lol, it have done this test with two m8's both on blades. i wouldnt be surprised if it was the speedo drive since i got it off fleabay lol

[firestormcrazy]

no just the ones that light 30 up and they dont light up when im doing 30 lol