I think this is a problem with F4i's and hope this subject hasnt been beat to death. What are your estimates on actual speed when the bike shows 30, 40, 60, 70? No, I dont need anything for above 140.
When going past one of those digital speed things they have in school zones, I notice, the readout says Im doing 25, my speedo says Im doing about 30. Thanks
ps If no one responds, Ill have to blow by that readout at 70.

 

On average, the speedos are off about 5 to 6%. It's different from every bike, plus wear and tear on the tires and any gearing change. If I remember correctly, my 600RR was showing about 76 to 78 when I was doing 70. I used 70 as the base to 0 out my speedo healer because it's the half way point from what I'll ever do. Plus, 70 is the normal top speed limit where I'm at.

 

5-6% off from the factory at least. I also did the -1/+2 gearing, which realy threw things off. I got a speedohealer and recalibrated things, and I have it to within a couple MPH of actual speed now. With -1/+2 gearing your top speed is about 140mph and that is what the bike reads now.