Speed wobbles at 65mph and higher

[Easy Rider]

Originally Posted by alanmcorcoran

Was the road grooved?

Most common cause.
IIRC, the stock GZ has a rib and groove that runs all the way around the center of the front tire......which makes matters worse.

Second, inspect the tires for uneven wear.
Then comes incorrect tire pressure and improperly aligned rear tire.
Could even be wind resistance from an improperly mounted windshield.