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Good after noon. I have a unversal m12 it starts up but rev high 3400+ and when try to kill the motor it wil lnot stop i have to pull the fuel supply what could it be?
First check if throttle cable is connected at control and engine.Motor is new to me. i start the motor and right off the back it rev to max the throtel does nothing and to kiss the motor off i have to pull the fuel line it self off
Just to clarify, diesels are stopped by cutting off the fuel. Some have a handle, some you pull the throttle back past idle, and some have a solenoid valve in the fuel line that is shut when you turn the key to off. It is not good practice to stop a diesel with the decompression control.Not wanting to state the obvious, but the M12 is a diesel engine. You don't turn it off by turning the key (or pulling out the fuel line). There should be a decompression handle near the controls (T shaped handle). Pull out the handle to kill the engine- then turn off the key.