Loss of power
So my bike had to be towed from the track to the dealer after only 6 laps on a track day.
under no load (i.e neutral) the bike will rev as high as you want, as long as you move the throttle slowly.
Any fast movement of the throttle results in a stall (either up or down).
The bike struggles to start, but will start.
when trying to ride you can maybe coax it up to 40kmh an hour but that's your lot. as if it has burnt the clutch or is missing a cylinder or spark.
For the detectives:
The engine sounds normal
the bike wheels easily in neutral (so not a drive train jam)
it does it in neutral (so it's not the kick stand sensor)
you can stall it easily by letting the clutch out (so not a broken clutch)
you can stall it in neutral (so not a gearbox or drivetrain issue)
it will start and rev (so not an ecu issue)
there is no engine warning light (not limp mode)
temperature is normal, will do it from warm or cold
i have removed the key and left it off for an hour, no change.
you can hear the fuel pump and you can feel the butterfly valve responding to the throttle position
no visibly loose wires or plugs
no damage to the bike (it was not dropped)
no 'hissss' of the fuel cap when i opened it (meaning no vacuum lock on the tank)
My bet is the fuel filter, i say this because the day before i ran out of petrol and had to walk to the garage (top of a hill) and borrow a fuel can. The fuel can was empty but i wonder if it had crap in it that has now blocked the filter. The dealer doesn't think this is likely as it's only just had it's 1000k service and i rode at least 50K's to work, home and then to the track next day before the problem happened.
i'm away for the next two weeks, so you have plenty of time to guess before i get back.
If you know what it is, chime in here and i'll let the dealer know.