Bonneville America Forums Forums Technical Forums General Tech EFI makes groaning noise -speedmaster

I don't see the squealing as a problem - I think it's normal.

Your stalling problem could be dodgy fuel or too low revs. What is your idle set at? It might also be a poor connection in the side stand cutout switch. This switch at the bottom front of the cradle is exposed to wet weather and can cause the engine to cut out. A liberal spray with lanolin or WD40 can help.