Isn't there a local outfit that takes gauges apart, cleans, lubes, calibrates?(tach/speedo, 1985 Cb650 Nighthawk)
Speed O Tach in Concord.
"what's wrong with them?"
Unusual symptoms:
Bike starts and revs up on choke, no movement in tachometer.
Warm up for 5 minutes, reduce choke, no movement in tachometer.
Pull in clutch, throw it in first, no movement in tachometer.
Let out clutch, increase throttle, roll about 10 feet,
...tachometer jumps to life!
So, I need less of a calibration, and more of a diagnosis, or at least a way to troubleshoot the problem. Bike sat for many years, only 16,500 original miles, runs strong. Not collectible, true, so not worth huge $$ investment. Just curious what would cause these symptoms?
A quick look at Ebay shows at least half of a dozen tach/speedo combos. It would probably be cheaper to replace than to pay someone to repair.
Yes, my thinking exactly!
It's just that damned curiosity about the symptoms;
I've seen some strange stuff on motorcycles, but
this one is really mysterious;
I would like to know the cause.
So today, I started engine, ran for a few minutes, then smacked the tach a few times, and Voila, tach works! So if I ever sell the bike I can just tell new owner to Smack the Tach!! and everything will be okay.