Here is an easy calculator you can use. You need to know your rear gear ratio and your rear tire diameter. The drive gear in a TH-400 typically has 15 teeth. The driven gears are color coded and fairly easy to replace. Remove the speedo cable, the gear cover and pull it out.
http://www.tciauto.com/speedometer-gear-calculator
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on 7/6/2021, 10:30 am, in reply to "