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So its cutting out and Diag mode is popping up on the right hand screen and showing the TPS position - i.e. exactly as if the diag wires had been connected.

No error codes, just the -1, 0, 1 as if the TPS is being adjusted.

Could be down to voltage drop, check battery voltage,all pos and neg battery leads including starter motor.
Check the block connectors are snug in the ECU,check the connectors to the dash, drown them all with contact cleaning spray,look for chafed wiring/poor connects.
Check the voltage drop as it turns over on the starter, worm brushes in the starter can cause massive voltage drop, enough to send the dash display into frenzy mode.
If you can rule out all of the above suspect the TPS,
My own does similar trick or treats

I've not checked the voltage drop however it has no problem starting. It doesn't do this when starting.

So today, it started fine. I got 20 yards before it cut out and brought this up. I started it up again and got 10 yards. Again, 2 yards, Again, 1 inch...

Turned it around, started up and rode back on the biting point of the clutch.

Runs fine in the garage. On the stand, in gear, engaging clutch while dragging the back brake to give it some load. Maybe not enough load.

It sounds like it might be the TPS. Can I just transplant from the other Falco and see if it fixes it or are they awkward to move?

I'd give Griff a ring at Aprilia Performance. It's likely he's encountered this before/

mangocrazy wrote:I'd give Griff a ring at Aprilia Performance. It's likely he's encountered this before/

I tried that but they're not open on the weekend

Griff was kind enough to give me a few pointers on Facebook on a Sunday.

For future reference: If this message pops up on the dash without plugging the diagnostic wires together then there's an intermittent fault with the ECU power supply or earth.

In my case one of the wires had come loose in bottom of the ignition barrel. I wiggled it by hand and it was the same as switching off the ignition so out on the road there must have been just enough vibration to trip out the ECU while still leaving the dash on.

The ignition switch is fastened to the bottom of the barrel with a couple of phillips screws and, once removed, can be prized apart carefully and the offending wire soldered back in place.

All back together now.

Cool ! All good and well done to that man with the secret Afro hairdo