I have come to realize that my speedometer is reading a higer speen then actual. It seem to be accurate up to 45mph however, after that the error factor increases. At an actual speed of 70mph the speedometer reads +/-85 and if that's not bad enough it gets incrementally worse.
By big objection to this isn't that I'm going slower than what speedo shows, it that more miles are being registered than are actually being drive. I guess that's great if you're in a mileage contest but stinks for resale. Plus, it'll shut up the Ole'Lady ... "OMG your're going ..."
Can this be adjusted? Is this a "dealer" ony repair? or do I just Ditch the babe?
all production metric bikes (don't know about american made) have their speedometers calibrated to show 10% higher than actual speed. the reason for this has been debated tirelessly in just about every motorcycle forum. saw one forum where this information was requested from top execs at a Yamaha. the reply was a little vague and ambiguous. basically, all these companies do it and it must be part of some regulation.
your speedometer is independent of your odometer. your odometer is correct so don't worry about that. and there are ways to calibrate your speedo to show correct readings. here's one site that offers a fix:
I don't remember where I saw this (maybe on here somewhere), but I read once that a car or motorcycle company can get into trouble if their speedometers read low, but within a certain range, it's okay for them to read high. There are factory tolerances on everything in the world including speedometers, so in order to be on the safe side for themselves, they set them to read a little bit high.
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I purchased a gagit call the F4 Speedo Healer. took literally 5 minutes to install, 2 minutes to calibrate and now there is no percevible speed differance between GPS & Speedometer. I'm guessing the differance is around 0.5mph.