Assuming it is a mechanical speedo and not electronic. The needle sits in jewelled watch type bearings with a counter hair spring holding it at zero. It is usually driven magnetically with an inner and outer drum. the inner drum being driven by the speedo cable. If oil or dirt get between the two drums it creates havock. Suggest careful disassembly of outer casing then wash with metholated spirit and air dry. Take care not to damage the hair spring.
68 views
Usually answered in minutes!
×