Yeah, I think it is. There was a misfire once while I was riding. And I think it feels a bit sluggish. But I can't really judge that. I bought the bike defect, and it's my first Harley.

 

First, I calibrated the TPS to 0.183 V with the ISC removed and secured the TPS in place. Then I reinstalled the ISC. I set the cold idle screw to 0.648 V and the hot idle screw to 950 rpm.

 

I’ve now checked the fuel pressure. After 1 minute, the pressure dropped from 3 to 2.8 bar; after 5 minutes, it dropped to 2.6; and after 10 minutes, it dropped to 2.4. What does this mean?

 

I believe the Harley MM EFI system needs 55-62 psi, same as the Delphi EFI...

An online converter says 3 bar is equal to 43 psi.

If I'm correct, you only had 43psi max, that is too low....

Ed will be able to correct me if I am wrong about the fuel pressure needed for the MM EFI.

You may have a leak in your fuel tank internals. The normal suspects are the in tank fuel lines, the regulator itself, a possible dirty/restricted fuel filter, and some later years had issues with cracked fuel pressure regulator housings...