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The engine on my 1725 makes a lot of noise. It's not from the exhaust, it's the typical "ratta ratta ratta" diesel engine noise. The 1725 is a 29 hp. My buddy's TC25 with 24 hp engine is very quiet in comparison. Is it just the nature of this engine to be noisey or is there something wrong with...

I have a NH 1725 that uses a knob to kill engine by shutting fuel off. A cable goes down to a lever going into the engine block. Anybody add a key activated solenoid on the fuel line or is there another way to shut engine off with key switch instead of having to pull the knob? It seems archaic...