I bought an f4i with -1+2 gearing and the speedo is way off. I'm about to order a speedoDRD but was wondering how hard it is to install and calibrate for a noob??

Also one problem is that the previous owner didn't install a speedohealer so it added A LOT of non-existent mileage to the bike. Is there any way I can program the speedoDRD to under run the mileage? Like for every 100mi I ride.. it only adds 50mi to the mileage?

 

The DRD is very easy to install and calibrate. If you have problems just get a mechanically inclined friend to help. You can send your gauges away to get the milage fixed. I think it costs about $75 to do so.

 

I too have the DRD. it is very easy to program.... easier to program than the Speedohealer I had and cheaper.... if you want your speedo to be acurate, ther is no way to make the bike read less miles....

 

I have a speedoDRD as well. It's easy to install and program. I have -1/+1 sprockets. With Bridgestone BT 016 tires, my speedometer is GPS confirmed accurate with a setting of -13.2

 

I got the SpeedoDRD and the RK Quick Acceleration chain and sprocket kit that I will be installing on my f4i today. Can anyone walk me through the correct programming of the SpeedoDRD for that setup?

 

If you cant figure out the directions provided in the instruction booklet, just give the owner Brooks a call. he will tell you how to do it and walk you thru it. I found the directions to be confusing but I called him and I had it programmed in about 30 seconds

 

Well, I was thinking that you guys would know how to program it with the 15/46/520 setup.

 

That would be 11.2%. Go here for links to the calculator (which I used to get your correction amount), a video of how to setup the device, and the manual.

 

After inputting the 16 to 15 (front sprocket) and 46 on the rear, with 120/70/17 tires I got -6.2%. How did you get 11.2%?

 

First of all, you use the rear tire size, not the front, which is 180/55/17 if you are still running the factory size.

As for how I got 11.2%. It's 6.2% off due to the gearing change, then another 5% for the factory speedometer error. See, I have always heard that motorcycle speedometers were inaccurate from the factory, that calculator claims most sport bikes are off 5%. Go back and look again with a little closer attention to what you are reading and you will see it.