81 kz650 Extra square bushing

I dropped my pan to fetch a cam tensioner bushing and found a second one I cannot place on partzilla diagrams or in the service manual.

Its about half the size as the idler bushings and marked UP just like them.

I juxtaposed it so you can see... I'm at a loss here.

Maybe a po dropped a cam guide damper down inside the engine & it got sheared by the cam chain or something. and then he left it in there & replaced it. ???

No its solid. If I was paying attention I think it may have been on the tensioner? Its thinner though and no Z mark.

Here's the size dif.

No eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationThe stock tensioner doesn't have a damper like that & the damper end of the tensioner pushrod is round & not really removable.
Obviously, I'm not sure where it came from, but to my eye now that I'm on a computer it's kind of similar to the 92075-232 dampers found on the earlier 650s with roller came chain. Those also have a rectangular damper on the end of the tensioner pushrod, but it doesn't look the same.

... KZ650-C1 et al. 92075-232


... KZ650-CSR. 92075-1314

That was my thinking.

I'm wondering if Kawasaki dropped one in and no one would have ever known.

Bike only has 9 k on it. It died a painful valve train death at the hands of a teenager too... So who knows what they tried...

Who knows. I don't. :laugh:

The guy could've ordered the wrong part, tried it anyway, then got the right part?

edit: in case you aren't aware, there's a pdf available for the 1981 KZ650. jarlef z650 >>> files section