J_A_M wrote:
yea could be the cable, could be a gear in the speedo head.
Also, there is a spring in the speedo head (not sure of the correct term, but it wraps around in a coil about 20 times). This cold be sticking. I know this because I stripped a speedo to every last screw and put it back together and this spring gave me grief. Similar symptoms.
Have fun!
Hmmmm, are you talking about the spring loaded, cam driven, pawl that advances the odometer for you as the speedo goes round and round????
Most common problem with these is that originally they start with a nice sharp edge to engage the odometer gear. Eventually the nice sharp edge becomes a nice rolled edge!! If you catch it early enough some very very careful filing can restore your edge and give you a few thousand clicks more service.
Remove the spring clip holding the pawl on and carefully slide out the cam drive - clean in white spirit or similar then apply a small amount of Molybdenum Disulphide grease to the annulus on the shaft (if too much oozes out when you replace it - you have too much - wipe away all excess grease). Similarly, jus a little on the main drive gear.
Cable advice as above.
Some people can be a little rough forcing the cable into the speedo head and this can lead to the drive gear and rotating magnet to foul the aluminium drag cup.
They aren't exactly a precision instrument but they do need care....
