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has the most rpm if I screw the mixture adjustment screw all the way in (the rpm do not change much if I change the adjustment screw, but they rise at the last quarter of a turn and until it is completely in).
Does it lighten up the hesitation, making it somewhat better? How is the response if you ease into the throttle?
Thanks, but the Morini forum is not as active, and I think the question and answer would be the same for a small Guzzi or a Morini, they are very similar anyway (Italian Heron head V twins...).
Do you have the hose that connects the two carburetors in place?If you have an original "blue cover" manual, the jetting specs. for each model are on page 26.2.
It certainly sounds rich to me but before going into the pilot circuit I suspect the choke plungers might need replacing. It's a brass cylinder with a rubber sealing surface at the base. When new the rubber is flat. After some time it gets deformed and hardens so it can't fully shut off the choke.I'd recommend starting there.
A good idea, but in my experience, a leaking choke plunger makes the carb rich *everywhere.* Changing the idle needle doesn't do much, also. Don't ask me how I know..
The 45 pilot jets finally came yesterday. The engine runs a lot smoother now, and the pilot jet adjustment screw is around where it should be (about 1 - 2 turns out on both carbs). I did not think it would have such an impact. Perhaps I should also try changing the needle position, just to see if it would be a further improvement. I always thought the pilot jet is just for idle, and the main jet takes over as soon as you pull the throttle.Thanks for the help!
idle jet will affect mixture for most round town riding, ie small throttle openings.Eg In London traffic I don't think I'm ever really off the idle circuit except for occasionally giving it the big'un to get past/round/away from an idiot....