Erratic speedo up to about 30mph
 

Speedo on my 46 is pretty erratic up to about 30-40mph. The cable gos through a gear changer for my Columbia then to my speedo. Any suggestions why I cant get steady reading while driving?thanks

Re: Erratic speedo up to about 30mph
 

Either the cable is dry, needs grease, or its not routed correctly, needs smoother less kinky corners

Re: Erratic speedo up to about 30mph
 

Thanks,will lube tomorrow

Re: Erratic speedo up to about 30mph
 

Disassemble the Columbia supplied Stewart Warner speedometer "transmission" while you're at it.

Re: Erratic speedo up to about 30mph
 

cas3, what do you lubricate the cable with?

Re: Erratic speedo up to about 30mph
 

You can buy actual speedo grease intended for this, but I just use a lithium based grease. Not the white stuff, it tends to dry up and get hard over time.

Re: Erratic speedo up to about 30mph
 

I oiled a speedo cable once, and it did not help. I then greased it and it did help. I think the grease acts as a damper of sorts and damps down the fast/slow action.
The fast/slow action is normally generated at a kink in the cable so check the routing. Also check it is not close to the exhaust at any point.
Mart.

Re: Erratic speedo up to about 30mph
 

Just a tip. When you disconnect the cable from the speedometer, immediately cover the end with a plastic baggy or some such. Those things tend to have a mind of their own and can leave skid marks on your kick panel and/or upholstery when you're pulling them out. No need to ask how I know.