Originally Posted by
RetroGrouch
Do you have a manual? Do you know what the specs are for compression? At least both cylinders are close to each other, that's important too. You can check if the speedo is good by removing it and insert a shaped wooden dowel into the cable mount. I use a carved chopstick. Connect it to a drill and spin the speedo. Check with both directions. Yes I have seen motorcycles with bicycle speedos and they work fine, probably much more accurate than a stock speedo. Should be okay for cert.
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