I have not found a Honda speedo in a car or bike to correct yet. My X is about 10% off. At 80 mph indicated my actual speed is 72.25. I have done a check with both radar and GPS. What you need to do is have your speedo checked. When I buy a new car I take it to a speedo shop so i can have the speedo checked and to date I have not had any Honda spedo even close to actual speed. Right now I have 4 Hondas, 3 cars and one bike. Just so you know Honda is not alone, my '97 Ford F150 is about 3 mph off and I had it corrected a bit with a different tire size.:hmm2:After fill up, we zero'd out and rode for awhile. When we stopped, I was curious to how far we went, and was setting at 82mi. My buddies vstar had us at 86mi. One of us (if not a bit of both) are off quite a bit.
Tha's the best way to check it out. I've heard anywhere from 6% to 10%. Most of my older Honda's were off 10%.it happens, especially on motorcycles. The VTX speedo (and henceforth the odometer) is off quite a bit, i dont remember exactly how much. If you want to figure out exactly how much you are off, you need to test it with a GPS.