Ice,

The easiest way is as follows:

1. Ensure the transmission is in neutral.
2. Ensure the ECM has no stored faults (DTCs).
3. WITHOUT TOUCHING THE THROTTLE, start the engine and allow it to warm up to 90°C (60°C on Bonneville, Scrambler, Thruxton, America, and Speedmaster models).
4. Leave the engine to idle for a further 12 minutes.

Regards,

Tom