Hi i am new to these engines, I have a Lister SL1 made in 1961. Im trying to get it to slow down the RPM because when it starts it goes full throttle When the switch is in the run position ,unless i hold the switch manually towards the stop position. i tried adjusting the threaded speed control protruding from the case i turned it clockwise but it did nothing. on the stamp it says 1800 RPM but when its running it seems to be running balls to the wall. I dont realy plan on using it for anything other than display so i want it to run very slow. is that possible ? thanks in advance[img]