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Message: <blockquote data-quote="Tazza" data-source="post: 21852" data-attributes="member: 82">The bolt under that cap i think they call "torque rise" If you change it too much you sill start blowing black smoke. This is factory set and really shouldn't be changed. I have never actually seen info on how to adjust this to factory spec, even with a repair manual.I don't see how adjusting this could give you more power either, the more fuel you add the more power you generate (to a limit). Its not like a petrol engine, a diesel draws in a full air charge every time, the only difference is how much fuel is added. Thats all that bolt does, it touches the governor arm to adjust the fuel flow from the injector pump.</blockquote>