Originally Posted by Bacchus
I thought the "upgrade" replaced tapereds with ball bearings.
It did as far as I know which makes the steering comparable to the 929.
There are so many variables here that I don't know where to start, but here is the "short list":
1: Tire pressure. If you are running the recommended tire pressures, it may be that you have a bit too much air in the rear tire (even considering the Givi's as the stock pressures are designed to accommodate a 160 pound rider with a 125 pound passenger).
2: Tire wear. If your tires are cupped (especially the front) this will aggrevate headshake.
3: Preload. Even though loading the rear of the bike (with the Givi's) is closer to the anticipated load, your should check your sag and if the front sag is greater than 38 mm or the rear sag is less than 30 mm, you need to adjust your preload to within this range. If you cannot, you need to respring both ends.
4: Suspension mileage. Stock suspension components start to go south after even 5000 miles, so if this is a commuter and you have racked up a lot of miles, it's probably time to consider at least a freshen on the front end and replacing the rear shock.
Without more information (like rider weight, mileage etc.) it's hard to be conclusive, but simply installing a damper will not resolve the problem, rather it will mask it. While making it easier to ride, you will probably need a lot of damping to overcome the problem which will make the bike less predictable in the event of an emergency situation.