My pressure washer is a Troy built 1902. There is no interchangeable nozzles. I can vary the spay using the nozzle. I guess the only thing to tell you what its not doing, is there is no way to control the engine speed if your not power washing (the trigger is release) no matter where the throttle control is set, once you release the trigger the engine will run wide open. It just will not idle. It is not suppose to do this. It should idle as long as you have water coming into the pump. There is just no control over the engine rpm after you release the trigger.
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