Using the TuneBoy program

The TuneBoy program provides the diagnostic functions that the official dealer tools provide. Below we will provide a quick run down of some of the more important functions the TuneBoy program provides, for more details you should read the documentation.

Throttle position reset

The Set Throttle Shuttoff Position button will send a command to the ECU to tell it a new value for the closed throttle position. The value that it sends is a high value.

The next time that the bike is started and left to idle (for around 10 seconds) the ECU will see that the value for closed throttle is higher than the current throttle position, this will cause the ECU to store the current throttle position as the new closed throttle position, thus setting the correct closed throttle position.

Closed Throttle Position Trim

Don't adjust the Closed Throttle Position Trim unless the corrected throttle position shows other than zero (when the throttle is closed) after using the method outlined above.

Idle Fuel Trim

Idle Fuel Trim is a very important adjustment for all bikes that do not have an O2 sensor. This adjustment being incorrectly set is the cause of most of the surge problems at low revs.

You can set this value by "seat of the pants" testing.

Take note of the current value so that you can set it back to the starting point if you do not like the results.
Start and warm up the bike. Then adjust the value until the throttle response feels crisp, we find that a value around +5% to +10% is a good starting point.
Ride the bike, adjust up or down by 2% and ride it again. When you feel that the bike feels it's best stop adjusting