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View Full Version : Spitfire Jumpy Spitfire Speedo



machinemd
06-01-2006, 08:57 PM
Hey Guys,
It's time to pick the experienced minds. The speedo on my 1976
Spitfire works great up to 70 mph. Once I hit 70 tho, the needle
swings back and forth over a 20 mph range. The cable was replaced
about 5 years ago to a one piece cable eliminating the counter. Whats
the concensus, cable again or speedo this time?
Thanks, Steve

aeronca65t
06-02-2006, 06:09 AM
Cable.
Take it out and lube the it real well before replacing it.
Or drive less than 70 MPH. /ubbthreads/images/graemlins/angel.gif

dklawson
06-02-2006, 07:18 AM
If re-lubing the cable doesn't help, consider sending the unit to a local speedo shop for reconditioning and cleaning. The pointer sits on a shaft supported by a needle bearing. The needle bearing is just a turned steel point riding in a little brass bushing. If these get dirty or start to gall, the needle can do all kinds of funky dances.

tomshobby
06-02-2006, 07:32 AM
Yup, lube it first. Also check for any kinks in the cable or a place where it may have gotten pinched.
If that does not help you can, maybe pull the cable itself and see if there are any wear marks on it.
Otherwise it would indicate the speedo.
I had a few Triumphs in the 60's when they were new and I had speedo and tach problems with them which required having a repair shop fix them.