Questions:
Was any work done on the front tire, wheel or suspension prior to when you noticed the shaking?
Does it only occur at or within a certain mph range?
Does the shake lessen or worsen with front brake applied?
Suggestions:
Check brake caliper and rotor for loose mounts
Use a dial indicator to check front rotor and wheel runout for possible warped rotor or bent rim
Completely loosen both upper and lower triple clamps and re-torque to spec