Not much adjusting to do, they pretty much bolt in and thats it. I'm old school and still betting on fuel delivery issues, gunk in the tank or something if the filter seemed to be clogged and that helped.

Another thing that would seem similar is a weak ignition, same symptoms as lack of fuel. Plugs/wires/cap/rotor all good? Check that aspect so you can wipe the board of the issue. This is as stupid as my 850 not starting after driving it into the garage.