Hi, thanks for reading this. BMW R 1100 RT. The whirring sound heard when switching on ignition is no longer. I believe this noise is something to do with petrol/power to the injectors. It was at first intermittent - by twiddling with the kill switch on & off sometimes came back - but now nothing. What is likely to be the problem & solution to this, can I test it - limited knowledge on electrics - & would it be possible for me to fix rather than the expense of a dealer. Thanks Sonny.

Sounds like the actual kill switch is faulty, many people use this to switch the bike off before turning key off DONT this is an emergency switch and is not built for constant operation.it is possible to test this but as you say you have limited knowledge. but here goes follow the wiring to see if there is a connector, there should only be two wires to the kill switch, at the connector disconnect it and the two wires coming from the bike up to the kill switch ,the incoming wires to the connector can be linked together, use another piece of wire pushed into the connectors, this should act as thought your kill switch is turned on. you should get the buzzing of the fuel pump back and be able to start the bike normally. changing the kill switch is not too hard but envolves dismantling the right hand control and as i donot know what you mechanical expertise are i will not lead you into this incase it is above your station so to speak. start with the basics of testing the kill switch.