Hi ALESSANDRO, I own a RD04 which also have these two fuel light. As you said the orange light is not broken because it lights during the test perfomed when you switch your bike on. The problem may be the fuel sensor in the tank. You can chek it trough the connector which is on the left under the tank (on RD04). Hope this will help you. Have a nice day/ride Steph. Black RD04 '92