I use a healtech speedohealer device,changing the sprocket will be 7% off
^^^ What he said for the 2-tooth change you posit. Speedo input comes off the xmsn output shaft so changing drive sprockets affects # of revolutions of the wheels for a given engine RPM; decreasing tooth count decreases the number of wheel revolutions per (*pick a unit of time*) thus decreasing speed. You also just decreased theoretical top speed by 7% (at redline, if your bike will pull to redline in top gear) and affected fuel mileage.... changing the sprocket will be 7% off
Your dealer and the others that think this don't know how the VRSC speedometer works.I have just changed out the front sprocket on 2012 Nightrod Special (international version) from a 30 tooth to 28 tooth sprocket. I have read some blogs which say that the speedometer does not need to be recalibrated as the input for the speedometer is taken from a point where the gear ratios do not effect the speedometer. I live in Malaysia, so I called Harley in Singapore, and they say that the speedometer does not need recalibration when changing the front sprocket.
I have mine set to 1341 pulses/km with the 28 tooth in the PV calibration.@rbabos, @stever975
Question... how do these calculations translate to the pulses/km setting on the map?
I'm moving from 30T to 28T as well... currently, for my 30T map, I've got 1215 in the "Pulses per km" setting. Does the pulses/km also get affected in the SAME manner as the indicated field?
i.e. as below... and also, which of the 2 is right?
1215 x 0.93 = 1129 pulses/km
1215 - 6.67% = 1134 pulses/km
Hi Ron,I have mine set to 1341 pulses/km with the 28 tooth in the PV calibration.
1341 - 28T
1245 - 30T
1437 - 26T
I come up with 1171 for the 32 tooth.Hi Ron,
Would you happen to have the # for a 32T pulley?