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I have been working on the bike and now it will not start!
It is most likely that:

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Some wire connection (including HT cables and sparkplug caps) has become loose or you have short-circuited the blue kill wire somehow.

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Equally often there are shortcuts in the switch off facilities (ignition lock, killswitch, relay, wires related to this have earth contact etc.) which blocks ignition.

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Timing settings may have changed. The rotor may have been loose and turned on the shaft, on external sensor systems the gap between sensor and rotor may have changes (if it is too wide it retards ignition or even prevents it at low - that is starting - revs).
What to to is:

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Check earth wires.

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Check HT cables, replace spark plug caps and spark plugs.

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Disconnect for testing the blue (kill) wire at the ignition coil to exclude any errors in the cut-off system.
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