Weird rattle/scratching and high pitch noise from engine

[tommyardin]

deffo the speedo drive take it out  and re grease  it be careful to put it back in properly or the lugs will break off

Could it just be wind noise, vent in top of helmet making noise?
Would make sense it getting louder the faster you go. Just a suggestion.


But my guess would be the same as others as the speedo sensor has recently been replaced.