When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I recently bought a 1999 1200-S. The bike is in excellent condition and has 18k miles. Yesterday I installed a power port for my iPhone so I'd have navigation. Today I went for a ride and compared my speedometer to the GPS. At lower speeds the speedo is reading 12 mph slower than the GPS (at 30 mph the GPS says 42 mph). At 40 mph on the speedo the GPS is reading 59, so the problem gets worse as speed increases. Obviously a problem that I want to correct.
Is there anything I can do about this or is this something dealer need to do? I have a FSM but thought you guys could give me a running start on what I should do about this.
Thanks Cricket. Yes the tires are stock sizes. No issues with Waze or my phone in any of our other vehicles. And the bike definitely feels like its going faster than indicated.
And I don't know if it matters, but I worked on the bike this weekend. I replaced the coil & wires and plugs. Removed the tank to do so. Also ran the Powerlet cord for the phone direct to the battery. I'm wondering could I have done accidentally done something while working. I was working slow and careful and didn't have any Oh **** moments.
Just a stupid question, but are you sure both units are reading MPH. The differences are almost far enough apart as if the speedo was reading MPH while the GPS was reading KPH. With the speedo reading 3 MPH fast, 27 MPH = 43 KPH. 37 MPH = 59 KPH.
Thanks Cricket. Yes the tires are stock sizes. No issues with Waze or my phone in any of our other vehicles. And the bike definitely feels like its going faster than indicated.
And I don't know if it matters, but I worked on the bike this weekend. I replaced the coil & wires and plugs. Removed the tank to do so. Also ran the Powerlet cord for the phone direct to the battery. I'm wondering could I have done accidentally done something while working. I was working slow and careful and didn't have any Oh **** moments.
Just a stupid question, but are you sure both units are reading MPH. The differences are almost far enough apart as if the speedo was reading MPH while the GPS was reading KPH. With the speedo reading 3 MPH fast, 27 MPH = 43 KPH. 37 MPH = 59 KPH.
Thanks. I did check the Waze setting and it's in MPH.
Thanks Cricket. Yes the tires are stock sizes. No issues with Waze or my phone in any of our other vehicles. And the bike definitely feels like its going faster than indicated.
And I don't know if it matters, but I worked on the bike this weekend. I replaced the coil & wires and plugs. Removed the tank to do so. Also ran the Powerlet cord for the phone direct to the battery. I'm wondering could I have done accidentally done something while working. I was working slow and careful and didn't have any Oh **** moments.
I installed a SpeedoDRD on a Honda after changing the gearing, worked great and made the speedo dead accurate. 40% is a BIG error, much more than a gearing change would cause though....I'd guess that probably something is wrong with either the sender or the speedo itself.
After doing some web research, it seems I should be looking at the speed sensor. Some say to clean it first, but many say it fails shortly after the cleaning and they have to replace anyway. Thoughts?
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.
Speedometer not accurate - need some advice
