Originally Posted by JesseT
RST has a overrun fuel shut off, but it's very differrently realized than in the XR3i. XR3i has a valve that opens and connect the air chambers above and below the plunger plate making it go to zero postition. RST has an electric mixture control that is been taken to full lean on overrun.
Electric-hydraulic. Operated by the blue thing on the side of the metering unit