Speedometer drive gear
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
The speedometer drive gear is a shaft that contains a worm gear. The square speedometer cable slides into the shaft at one end of the gear. The other end of the gear (the portion that contains the worm gear) fits into the transmission.
Removal and replacement
Extreme caution must be exercised whenever the speedometer drive gear is removed. A special washer is located on either side of the worm gear. The purpose of these two washers is to prevent undo wear as the drive gear rotates. It is easy to retrieve the washer on the top end of the worm gear...it comes out when the worm gear is removed. The washer on the bottom end of the worm gear does not come out automatically. If you are not careful, it is possible for this washer to become dislodged and fall into the transmission...ruining parts that you do not want to ruin. So, using a magnet, needle nose pliers, long slender pick, or similar object, carefully remove the lower washer. When reinstalling the speedometer drive gear, adhere the washer to the worm gear with a dab of grease.