How it works:
1) Electric TPS on the carburetor sends throttle position to ECU.
2) ECU reads throttle position and sends variable speed signal to PWM oil pump according to pre-programmed map in the ECU.
3) Variable speed oil pump meters oil according to ECU map between 100:1 (low RPM) and 32:1 (high RPM.)
All components are electrically operated and interconnected. If the ECU detects lack of connection it triggers a warning relay which lights a warning light on the speedometer display. There is no actual verification that oil is flowing out of the pump and there are several scenarios where the oil pump doesn't pump oil and the ECU doesn't know it. Most common reasons seem to be blocked lines, corrosion or other failure of rectifiers or capacitors responsible for steady clean voltage supply required for OI to work, and bad or wrong ECU installed on the bike.
Here are a few previous threads you may find interesting. I've read other similar stories like these on other Beta forums and Facebook groups.
viewtopic.php?f=13&t=1926viewtopic.php?f=13&t=1922viewtopic.php?f=13&t=2068It's great when it works, but in general appears to be a fairly fragile multi-component design dependent on an electrical system that seems to have its own problems with failure. Personally I don't trust it.
The 2015 250/300 RR Owner's Manual suggests 60:1 (1.6%) premix ratio. I run 40:1 in my 2016 Xtrainer 300.