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techtalk:ih:elec03 [2025/10/27 03:47] – [Deleting Wheel Mount Speedometer Drive Unit (1973-Up)] hippysmacktechtalk:ih:elec03 [2025/10/27 15:39] (current) – [Speedometer Drive Gear (1973-1983)] hippysmack
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 ==== Speedometer Drive Gear (1973-1983) ==== ==== Speedometer Drive Gear (1973-1983) ====
-The speedometer drive unit was moved to the front wheel, right side, in 1973. 1970-1973 XLH, XLCH used Veglia (Italian made) instruments. And the 73 drive unit (67127-73) was also from Veglia. In 1974, the MoCo started using Nippon Seiki (Japan) gauges and drive units. The new drive unit didn't have the grease fitting as did the 73 unit but has the same part number as in 73, and retrofitting to 73 models for replacement. \\+The speedometer drive unit was moved to the front wheel, right side, in 1973. 1970-1973 XLH, XLCH used Veglia (Italian made) instruments. And the 73 drive unit (67127-73) was also from Veglia. In 1974, the MoCo started using Nippon Seiki (Japan) gauges and drive units. The new drive unit didn't have the grease fitting as did the 73 unit but has the same part number as in 73, and retrofitting to 73 models for replacement. The unit has a .300" wide seal spacer. \\
  
-The unit has a .300" wide seal spacer. The unit fits on the axle, somewhat like a spacer, with a small tang that fits into the hub to keep the outer assembly from spinning. If the tab doesn't seat into the hole in the hub correctly, it can come loose and scrape against the hub as it turns and stop the speedometer from working. \\ +**Common Issues**: \\ 
 +The unit fits on the axle, somewhat like a spacer, with a small tang that fits into the hub to keep the outer assembly from spinning. If the tab doesn't seat into the hole in the hub correctly, it can come loose and scrape against the hub as it turns and stop the speedometer from working. \\ 
  
 The front wheel speedo drive unit contains two small meshed gears and some grease. The gears can come loose or receive wear. The grease can get sand etc in it, etc etc. This wil also affect the accuracy of the speedometer. Easiest way to fix that is to just replace the unit. You could try to make it work by removing and refurbishing it but they do not really come apart without wrecking it. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197284-wrong-speedometer-or-speedo-drive/page2)) \\ The front wheel speedo drive unit contains two small meshed gears and some grease. The gears can come loose or receive wear. The grease can get sand etc in it, etc etc. This wil also affect the accuracy of the speedometer. Easiest way to fix that is to just replace the unit. You could try to make it work by removing and refurbishing it but they do not really come apart without wrecking it. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197284-wrong-speedometer-or-speedo-drive/page2)) \\
  
 There is also an internal threaded stub on the drive unit for the speedometer cable to screw into. The cable end has a male threaded nipple made to it that screws into the female threads on the drive unit stub. The threaded stub should not wiggle or have any slack that would allow the cable to wiggle at this connection or it will alter the speedometer readings. \\ There is also an internal threaded stub on the drive unit for the speedometer cable to screw into. The cable end has a male threaded nipple made to it that screws into the female threads on the drive unit stub. The threaded stub should not wiggle or have any slack that would allow the cable to wiggle at this connection or it will alter the speedometer readings. \\
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 +The drive unit is not considered servicable and it should get periodically lubed when you lube the speedometer cable. However, if you rarely lube that cable, the drive unit doesn't get lubed either. There is a little wire clip ring that holds the rotating cover with the finger snuggly to the body of the unit but the cover won't come all the way off. However, there is enough room gained with the clip removed to repack the unit with grease. You can clean the unit out with brake cleaner, blow it out with compressed air and drop a couple drops of some lube (75-140 transmission fluid?) in it. Spin it around a couple times to distribute the oil, repacked it with wheel bearing grease and reassembled it with a new outer gasket. ((bikedelic of HD Forums https://www.harley-davidsonforums.com/threads/speedometer-drive-unit-question.41835/)) \\
  
 You have to remove the axle to replace the drive unit since the axle slides thru the forks/wheel from the right. \\  You have to remove the axle to replace the drive unit since the axle slides thru the forks/wheel from the right. \\