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Speed sensor counts the teeth on the gearbox output sprocket. As the speedo is set to read high, going up a couple of teeth on the rear sprocket tends to increase its accuracy, although the ODO will be out. If you want to keep the speedo reading as it does now you'll need a speedo healer after a sprocket change. You dealer is correct in saying that a speedo healer isn't needed if the sensor is on the front wheel, but as it isn't, and as your dealer doesn't know, I'd find another dealer who does know. No one's reported any problems with sprocket changes, but the EFI uses the count in conjunction with the engine rpm to calculate which gear its in and modify the fuelling accordingly. Program Fifa Manager 2008 Kitchen.

I'd guess that the differences are too subtle to matter. Speed sensor counts the teeth on the gearbox output sprocket. As the speedo is set to read high, going up a couple of teeth on the rear sprocket tends to increase its accuracy, although the ODO will be out. If you want to keep the speedo reading as it does now you'll need a speedo healer after a sprocket change. You dealer is correct in saying that a speedo healer isn't needed if the sensor is on the front wheel, but as it isn't, and as your dealer doesn't know, I'd find another dealer who does know.

No one's reported any problems with sprocket changes, but the EFI uses the count in conjunction with the engine rpm to calculate which gear its in and modify the fuelling accordingly. I'd guess that the differences are too subtle to matter. RobOk, now I'm gonna confuse the issue a little!! I was riding with a mate while he was on his V-Strom, and we were talking via bluetooth headsets trying to determine who had the most accurate speedo via his GPS readout. While travelling at 80kmh, I was within about 3-5kms but my friend was even higher.

As we increased speed, my accuracy became better to the point I was almost exact to the GPS. BTW, I have the 2010 ABS model, so I'm not sure that makes any difference.

Can you explain this at all William? ABS makes no difference. Because in most countries speedo accuracy is legally mandated to be in the range of -0% - +10% manufacturers set their speedo display in the middle of that tolerance window - usually at about 7% high. This is the display only.

The underlying counters aim for accuracy and the Odo is usually much more accurate. I'd guess that the reducing error of your speedo was a result of either an issue within the instrument movement (most likely) or an a/d converter issue. It illustrates why the display is set high, as otherwise yours might have started to under read. Be aware that GPS can easily be out by 5%, although it's usually nearer to 1 or 2%, but that it can read low as well as high. It works by calculating time over distance, and while the clock, once it's locked on, is very accurate its positioning, which it uses to calculate distance, can be less so. With a gps mounted on another bike, even if you were riding side by side and almost touching, the positional data wouldn't be particularly accurate for your bike. There's too much scope for error in this particular experiment too attach any great significance to the results.