Quite some time ago I was riding the bike as usual when I pulled onto the Blackwall Tunnel approach and found the throttle didn't respond - or rather it had been fine up to 40-50mph, but then there was no more power, acceleration or anything. I later realised that the clicking sound that I had always heard on startup for 2-3 seconds was continuing continuously and not going off, so I thought it was a fuel pump problem which was confirmed by reading a few forum posts. I had to just put up with it for a while, which was okay as I'm based in London and rarely get to open the throttle more than 1/4 way or go over 50mph.
Now it's the summer I've got some time and pulled the bodywork and tank off, but testing the fuel pump showed that it gets enough pressure (47psi) and pumps plenty of petrol (1/3 - 1/2 a pint in about ten seconds). The clicking seems to be coming from the butterfly valves trying to move. Whatever the actuator is meant to do, it is acting like it is having an epileptic fit. I don't know if the actuator is unable to move the valve linkage, if the actuator is just malfunctioning and not operating or if it is getting the wrong signal. It's my first bike with fuel injection and I just don't know quite how it is all meant to work.
Has anyone had this problem ? I couldn't find it with the search function.