Buzzing sound ignition before I start the bike

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Buzzing sound ignition before I start the bike

Gilera Runner 125 ST - I put the key in, turn on the ignition and for around 30 seconds makes a really strange buzzing / vibrating sound from the front of the bike.

Bike starts fine and the buzzing stops, but clearly something isn't right, Anybody have any ideas on this?

Just sounds like the fuel pump coming up to pressure to me....

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