Topic: Testing gauges?

[71 V12]

I recently bought a pair of CB750 K0 gauges requiring new plastic covers and lenses. However before I replace the covers is there way to test the function of the gauges using a drill to drives the cable?

If so this method would work should the drill rotate clockwise or anti-clockwise?

Many thanks,

Kevin

[BenelliSEI]

I stick a “2 Robertson bit (Canadian square screw head bit) in my rechargeable drill. Fits right in the drive of the instruments. Reverse rotation. No cable required.

If you don’t have a Robertson bit, a wooden matchstick works too.....

[71 V12]

Hi Benelli,

Thank you for the reply. I was born in Ottawa, my folks returned to the U.K. when I was nine but fond memories of my childhood in Canada. It was safe, I could go anywhere on my bicycle. Played hockey, lacrosse and baseball. Pink lemonade, maple syrup...... and I remember the square drive screws!!

Anyway your hint works great. Speedo seems good. But the Tachometer goes off the scale with the slightest rotation from the drill. I have sprayed switch cleaner on the exposed parts with the cover off and it’s working a bit better but the tachometer needle is swinging at very low rpm’s from the drill.

Should I do any further disassembly to clean? Should any parts be lubed? If so what lube is recommended?

Many thanks,

Kevin

[BenelliSEI]

Kevin.... sometimes, just repeated use will help that condition..... google it and see what comes back.
The Robertson screw is a Canadian invention. Henry Ford loved it, as the screw sticks to the bit, an ideal situation for production lines. Ford wanted to buy the Company and Patent. Robertson refused and Ford went with Philips. To this day, the US builders struggle with screws constantly dropping off their drivers.

[71 V12]

Hi Benelli,

Thanks again for the tips. Repeated spins and switch cleaner has got the tachometer now responding progressively with increase/ decrease of the drill rpm’s👍👍

[BenelliSEI]

Excellent!