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billmeek said:
The state troopers radar gun and the portable radar sign both indicated my Burgman 400 speedo is off by about 6% rather than the expected 10.
Bill, I can't remember; do you still have the OEM tires, or do you have Pirelli's?

I know the digital speedos on the 650s are almost exactly 10% off (or at least mine is), but maybe with the 400s it is only 6%.
 

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billmeek said:
Brian said:
Bill, I can't remember; do you still have the OEM tires, or do you have Pirelli's?
Stilll running the factory tires so far. Only have a little over 2k miles on them.
Interesting.

So when your speedo said 65, the RADAR said 61?

Or was it RADAR said 65 and your speedo said 69?
 

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billmeek said:
Speedo said 65, the RADAR said 61.
Very interesting.

Also, recently there has been a report that the 650 is only 3MPH fast at any speed:

WLB :>) said:
... I went past one of those friendly roadside radar monitors the other day which gave me an excellent chance to check the speedo accuracy, and like my AN400, the AN650's speedo is exactly 3 MPH fast.
More research seems to be indicated.

[Read that as an excuse for me to resume my high-speed shenanigans. 8) ]
 

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gruntled said:
Tried the GPS thing. Easy to do on a car with cruise control. Hard to do on the bike. You have to try to hold the speed exact while you watch the GPS & the road. With the car the GPS held fairly steady, with the bike it was moving all over the place.
Problem with the radar signs is that all the ones I have seen only show your speed IF you are speeding, otherwise they show the posted speed in a different color. To check your speed you have to go faster than the posted speed.
If you have a GPS with a log, you could run at a steady speed for a while then go back to the log later to see what it truely was. Not all GPSes have logs, though.

In my area we don't have the RADAR signs like you describe. Ours have a standard speed-limit sign above and a "Your Speed Is" RADAR indicator below. It shows any speed; below, at, or above the limit.

They're portable, and they are moved around from place to place. Next time I see one I will definitely return in the wee hours when no other traffic is about to do some more testing. :)
 
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