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Tacho slap!!

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brianm:
On my CB750 I have fitted a used tacho, which I have checked using a cordless drill and it seems fine.
When I am riding the tacho bounces around and I can hear it slapping/clicking. I doesn't make that noise with the drill on it.
Can the tacho drive be removed without removing the engine?
What would cause this???

Brian

rigwit:
could be a broken or about to break inner drive cable or one of the flexible coils have opened/broke causing it to stick in the sleeve cover of cable.  also look into the rev unit to see if the square drive input isnt broken  ie  one edge split.......

AshimotoK0:
Could it be a lack of damping fluid in the dashpot damper?

cheers

Ash

brianm:
I connected the drill to the engine side of the cable and it was spot on. Is the damper inside the Tacho?
Brian

Bryanj:
yep, but dont foget the drill is a steady turn not a varying speed

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