S&S Cycle Speedometer Calibrator (Part 55-1007) - Manual (Page 3)

NOTE - Indicated speed or mileage refers to reading taken from
inaccurate speedometer prior to correction. Actual speed or
mileage refers to reading taken from radar, accurate
speedometer, mileage markers, or other source.
Examples:
A. Speedometer method - Inaccurate speedometer
reads 65 MPH. Actual speed is 75 mph.
Percentage change:
75 - 65 = +10 = +15%
65 65
See Picture 3
B. Odometer/mileage method - Odometer reading is
10.6 miles, compared to actual distance traveled of
10.0 miles.
Percentage change:
10.0 - 10.6 = -0.6 = -6%
10.6 10.6
C. Gearing method - Original 32 tooth transmission
sprocket was changed to 34 tooth sprocket.
Percentage change:
34 - 32 = 2 = +6%
32 32
See Picture 4
OR:
Original 70 tooth wheel sprocket was changed to 65 tooth
sprocket.
Percentage change:
70 - 65 = 5 = +7%
70 70
NOTE - Calibration percentage will be positive (“+”) if actual
speed/mileage is greater than indicated speed/mileage.
Percentage will be negative (“-”) if actual speed/mileage is less
than indicated speed/mileage. If gearing method is used,
percentage will be positive (“+”) if new transmission sprocket has
more teeth than old sprocket, negative (“-”) if new transmission
sprocket has fewer teeth than old sprocket. Also using gearing
method, percentage will be negative (“-”) if new wheel sprocket
has more teeth than old sprocket, positive (“+”) if new wheel
sprocket has fewer teeth than original sprocket.
Adjust Speedometer Calibrator
After calculating calibration percentage, turn adjustment screws
to obtain correct percentage.
NOTE - Scale of adjustment screw on left reads in increments of
10%. In other words, setting left screw at “2” position results in
+20% change in speedometer/odometer reading. Scale of
adjustment screw on right reads in increments of 1%. In other
words, setting right screw at “2” position results in +2% change
in speedometer/odometer reading. Setting of left screw plus
setting of right indicates total calibration change. As mentioned
previously, slot in each screw has small notch in one end. Notched
end must point toward selected number.
Confirm Calibration Accuracy
Install seat and confirm that seat and hardware do not contact
Speedometer Calibrator or wiring. Road test motorcycle and
verify speedometer accuracy using radar or speedometer or
odometer method described previously.
NOTE - S&S ® Speedometer Calibrator remains attached to
motorcycle. Removing calibrator returns speedometer to stock
calibration factor.
3
Picture 3 Picture 4