FSE 06 will not fire

[Wilko]

I have an issue,
I started my FSE450-06 the other week no problems,
2 days later, I turn the key and the fuel pump noice/sound is very very faint, but bike fire and runs fine, next day try to get it to fire and all it will do is turn over and make a loud pop out the exhaust.
I changed the sparkplug no joy, I checked the relays all is well.
Took it to a gas gas dealer he plugs in computer and it says all is fine, they start looking for things contact importer and thay get them to check a few thinks, seem to think it is the crank senser, still waiting for it to arrive from OS.
Do you think the lack of fuel pump noise / pressure might play a part as it has been pushed into the corner of the workshop until the senser turns up.
Has anyone else had this issue.