Two weeks ago got pulled for speeding. Cop says he clocked me 57 in a 35. Since I was already going to be late for work did not want to argue and be later, but no f'n way I was going that fast in 4th, rpm's would have been pretty damn high. If he said 47, maybe plausible. He wrote the ticket for 9 miles over $131 vs >$200.00 (thanks). Either way I was over the posted MPH, and will deal with that. The other day I was crusing and noticed speedo only showing 30, but I know it was way higher than that. So my question is where to start troubleshooting? Speedometer, speed sensor? Or am I way of base, and something else?

Thanks

 

Quick check - see if your miles match up with highway mile markers.

 

Understand why your the GrandPoohBah. Great idea.

Thanks

 

Check your speedometer against a GPS.

 

every one i ride with that has a harley is off by 3mph @ 70mph. so when are speedo shows 70 on th freeway we are actually doing 66-67mph.
we have all checked ours off of GPS readings.

 

have you changed the size of your rear tire? changed transmission or gearing? drive belt pulley ratios? ECMs?

depending on your bike and what you changed (no info given) you could throw off your speedometer when you change things in the drivetrain. Your speed sensor could be faulty. Your speedometer calibration ratio could have been accidentally altered during an ECM reflash.

 

No tire changes or major mods, just noticed it being off. I will try both mile marker and GPS to check.

thanks

 

It is not difficult and also free to pull the speedo sensor and see if it has any metalic "fuzz" sticking on it. There used to be a lot of auto turn signal cancel, speedo and faulure of radio volume to auto adjust for speed traced back to that or an outright sensor failure. Perhaps someone knows if it can be checked with an ohm meter and what the reading should be.

 

My wife was following me back home from a long trip and I had my cruise set at 72-73 mph. She said that she had hers set at 70 and she caught up to me pretty quick and was on my a$$.

I often wondered if my speedo was off cause going 80 I get passed up by old ladies in Cadillacs all the time

 

Cant resist it. jon0897, are the little old ladies from Pasadena?