I have bought a 1990 100XP. There is the main fuel hook up and beside that there is another smaller hose which I believe would have been a oil feed. I am new to these motors. Someone has put a nail (gutter spike) into the end of the smaller line which I am assuming someone bypassed the VRO. There is a small wire (2 strand) that comes threw the main wiring harness and hooks to something up by the top of the carb? It is still hooked up but someone has cut it about 2' outside the front of the motor. There is no oil resivoir anywhere. I mixed the fuel in my tank 50:1 thinking it was bypassed. Approx. 1-3 minutes into the engine running I get a alarm intermittent beep pause beep pause ect. I would ask the original owner how he had the rigged biut he has since passed away. Any way I can get this alarm to stop and just mix my own fuel?