Running without Tach cable ok?

I've got my '82 KZ750 running great now, but I've got a whrring/rubbing sound that I think might be from the engine when I accelerate. Nothing at idle, and nothing when I let off the throttle.

Sounds like it's coming from the front of the bike. I've pretty much eliminated the front (rebuild forks, replaced front wheel bearings) The sound is the same frequency as the vibration in the tach cable so I thought I'd remove it to see if that's a possibility.

Any danger in running without it for a little bit? I figured that I'd get a little oil out of the engine and I'd better keep the rpm's down at a safe level.

Wanted to try this before I had to contemplate something inside the engine like a cam chain or primary chain. Any thoughts on if those are possibilities?

Thanks!

If you can find a cap nut with the same thread pitch to seal it up temporarilly, I don't see any probs with running it like that to chase down the noise you're hearing.

Have you checked your points/ignition and rotor to see if there's possibly something rubbing in those areas yet?