Engine "Chatter"

[Canuck]

Hey GZ'ers

As the topic suggests... I have an issue with the bike making excessive "chatter" sounds. For awhile it was difficult to pinpoint.. so i just went with it... but as i've grown to love the bike.. I wanna keep it around for awhile so I wanna work out all the major to the most minor of problems.

The "chatter" gets progressively higher as it approaches time to upshift the gears.
(The Chain is new and has been tightened to the specified adjustments, so that has been ruled out..)

I have been thinking that now the bike is around 34000 Kms
There is small oil leak seemingly to be coming from the bolt closest to the spark plug area...

So I'm thinking... get the bike shop to specifically check out the CLUTCH + Cam Tension + Gaskets?

It seems like the gaskets are starting to show their age....the bike is an 03' and I'm unsure of the time between gasket changes and if that's a feasible reason to experience lower oil pressure or something else that would cause this "harmonic Resonance" as my motorcycle service guys cleverly suggested.... :shocked:

Thanks for the input