Front end vibration (99 IS)

[SpidyJ]

First time ever yesterday.  Vibration occurs at 100 mph and over.

Slowed down and sped up 3 or 4 times.......came back each time.

Likely causes and fixes?

[Daniel Meyer]

1) Tire pressure. Check with multiple gauges to make sure you have a good gauge. Front AND rear.
2) Tire condition. Front and rear. Get the bike off the ground and rotate them, looking carefully for out of round or tread separation.
3) Rear shock bushings.
4) Steering head bearings. Just change 'em if they haven't been done and torque them to the manual procedure EXACTLY...the Valk is picky about this.
5) Swing arm bearings (unlikely).

That's the order I'd be looking in...

[Ricky-D]

Time to balance your wheel/tires.

***

[SpidyJ]

Thanks fellas.