if you still have a factory warranty then id get it done at a dealer. Does the vibrating change if you give it more throttle? If your at a stop and you rev it can you hear it? Id get a stethescope or even a screwdriver and put your ear up against the motor to try to pinpoint the location
01 yellow 400ex
Armadillo Skids
HC Stage 1 cam
CRF cam chain
HMF slip on
UNI
Maxxis Razr rear tires
Stock front
Tinners scoops
MSR AOF clutch perch & lever
Oury super soft grips
Moose Racing e-brake block off
450R front shocks