Refitted my Hitchcock's carb conversion. I originally fitted this about two years ago, then in a fit of misguided curiosity last month I thought I'd see if I could refit the EFI. This I did without difficulty and was somewhat surprised when the engine started and ran fine and the MIL showed no faults. (Odd, to me at any rate, since there were only a couple of sensors connected for the last two years. I would have thought that loads of faults would have been stored). Anyway, all was well for a month or so, then recently it began to suffer (again) from a bout of the jitters. Basically it would misfire on larger throttle openings until the engine was quite warm, after which it ran fine.
This was the sort of issue that caused me to fit a carb in the first place, so I decided to refit the carb and leave behind all the hassle. Second time around I refitted the carb in less than 3 hours. Pressed the starter and lo and behold! it ticked over slowly and reliably and ran well. I'll keep the EFI bits to refit when I sell the bike but really it has been nothing but a right royal PITA on my bike. The luck of the draw probably but I've decided I don't need the hassle. BTW, did you know that nothing electrical works if you have removed the headlight rim, which I did to disable the MIL light which would otherwise be permanently on without most of the EFI sensors removed? It seems it provides an earth, probably to the ignition switch. As soon as I refitted the rim to the light everything was then operational. Go figure...
Next time I feel the urge to try again with the EFI (unless to sell the bike) I've asked her indoors to beat me on the head with a broom handle to knock some sense into me.
Maybe those who try loads of things trying to source a fault with the EFI and get nowhere might like to take note: just chuck it in the bin and fit a carb conversion. Then you can just ride yer bike.