Honda CRF1100AL 2019 Owner's Manual page 324

Audio System Trouble
Symptom
Unable to connect
Bluetooth® device
320
Depending on the Bluetooth® device and application software
you use, it may take some time for the audio system to connect
to a device and to start playing an audio file.
The connection may be temporarily disconnected when starting
the engine, which is normal and not a malfunction. The
Bluetooth® device will be reconnected after the engine is started.
Check that your Bluetooth® device has been paired. Refer to the
instruction manual of your Bluetooth® device and check that
your Bluetooth® device is in connectable state.
Cause/remedy