Speed odometer is off
- Thread starter Cisco2238
- Start date
Dscahill
Registered
Has the gearing/tire size been tampered with? If so a SPEEDOHEALER will fix that, otherwise I havent a clue. There is a normal margin of error in speedos, say 5%, and at low speeds that error is minimal, but the faster you go, that percentage is a larger number..but 10-15mph seems high, unless you are going 230?
Hope that helps
-D
Hope that helps
-D
Stock gearing is 17/40
stock rear tire is 190/50/17
A smaller front sprocket or larger rear will make the speedo read faster.
But, as said above, the speedo is off from the factory.
SpeedoHealers work great, and you can program them for any tire or sprocket(s), including stock.
stock rear tire is 190/50/17
A smaller front sprocket or larger rear will make the speedo read faster.
But, as said above, the speedo is off from the factory.
SpeedoHealers work great, and you can program them for any tire or sprocket(s), including stock.
piratediverjefff
Registered
SpeedoHealer is the way to go,I've checked mine several times with a GPS and it's always right on the money(also has that cool little "highest speed attained" recall button 
).
).
Found this example of max speed recall on U Tube
mattymatt716
Registered
Mine was off by 10%. So, going 30mph, no big deal. Worse at higher speeds, obviously.
How did I find out? Was getting passed by a Prius when I realized there might be a problem..... true story. I had just ridden it off the lot. I then did my research and realized that this is "normal" with most people on two wheels. The companies know about it, but no pushing or prodding brought anything out of it.
Speedo healer or sprocket change. Sprocket change will affect the odometer, but Speedo healer won't (or, that's what I heard).
How did I find out? Was getting passed by a Prius when I realized there might be a problem..... true story. I had just ridden it off the lot. I then did my research and realized that this is "normal" with most people on two wheels. The companies know about it, but no pushing or prodding brought anything out of it.
Speedo healer or sprocket change. Sprocket change will affect the odometer, but Speedo healer won't (or, that's what I heard).
piratediverjefff
Registered
Man that's a nice stretch of straight road!
nosbig
Registered
RedBusarider
Registered
10-15 off? How did you check this? At what speed?
Yes they are off some from the factory and the faster you go, the more off. Even 10mph off seems high, if going less then 100mph.
So if stock tires and stock gearing it's bound to be off some - mine was about 5% off, reading higher then I was actually going.
I'm going to take a wild guess and think you bought it used. So do you know if the bike had stock everything when you bought it?
Many guys put a bigger rear sprocket on and that would change your speedo more then from the factory. That's about the only way I could see 10-15 off.
Yes they are off some from the factory and the faster you go, the more off. Even 10mph off seems high, if going less then 100mph.
So if stock tires and stock gearing it's bound to be off some - mine was about 5% off, reading higher then I was actually going.
I'm going to take a wild guess and think you bought it used. So do you know if the bike had stock everything when you bought it?
Many guys put a bigger rear sprocket on and that would change your speedo more then from the factory. That's about the only way I could see 10-15 off.
piratediverjefff
Registered
Didn't have a GPS to check mine when I had stock gearing,but when I went to a 44T(and got a GPS to set my SpeedoHealer)it was off 9-10%(100 mph indicated was about 91 mph by GPS).From everything I've seen posted over the years most speedos with stock gearing usually average about 7% high.
piratediverjefff
Registered
Was that one of your videos Pirate 
piratediverjefff
Registered
Looks like a 220 mph speedo to me...and I don't have one.
I think the Busa speedo is way over optimistic above 90 mph. I don't know if that is on purpose or wheel spin. I once came home with my chest pumped out because I hit 175 mph. Check the max speed on the GPS and it was only 161 mph! So I basically go by my GPS even with the speedo healer. I did compare my GPS to my Android phone and they are within 1 mph of each other up to at least 150 mph. Still, for real speeds (i.e. below 70 or so) a speedo healer is a good thing. I was also told that the corrected speed is fed to instrument cluster (alters the signal at the speed sensor) so the odometer is corrected too, so your bike will have the correct speed.
piratediverjefff
Registered
Looks to do the same as the SpeedoHealer,just slightly smaller(and only available for a couple bikes at this time?)and $45 cheaper.
Speedometer Correction/Calibrator - AdventureTech, LLC.
Speedometer Correction/Calibrator - AdventureTech, LLC.
RedBusarider
Registered
I went with a new sprocket which should get me pretty close to accurate and I expect better gas mileage too.
Just adding a speedohealer might correct the speedo but won't help gas mileage.
Just adding a speedohealer might correct the speedo but won't help gas mileage.
RedBusarider
Registered
I went with a new sprocket which should get me pretty close to accurate and I expect better gas mileage too.
Just adding a speedohealer might correct the speedo but won't help gas mileage.
Just adding a speedohealer might correct the speedo but won't help gas mileage.
piratediverjefff
Registered
Probably wouldn't help mileage(the SpeedoHealer)a bit Red,you'd more than likely cruise a little faster(before when I thought I was doing 80 mph I was actually doing maybe 71-72,now when I'm doing 80 mph I'm actually doing 80 mph).
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