250sx Cam Chain Questions

[Higdonaw]

I just got a 86' 250SX. Seems to be in really good shape for the most part. The cam chain has some rattle to it though. At what point should this be replaced? It is a little noisy compared to my 87' 250es but not near as noisy as a 85' 250es I used to have. Also, I noticed that you can get "new" cam chains still but I haven't saw any "new" cam chain guides for sale anywhere? Are "used" ones Ok to use or are they not much of a wear item? Thanks for your time!

[Flyingw]

If the coatings on the guides are ok, reuse them. I have only seen a couple of guides that needed replacement.

[250rheath]

Usually all you need is the chain

[Higdonaw]

Ok Sounds good. If I understand correctly, the tensioner is an auto tensioner right? Do these need to be replaced also? Thanks.

[Flyingw]

Nope, just rewind it after the new chain is installed. You do have to remove it to replace the chain so a fresh gasket will be needed.

[tri again]

I wish there was a measurement for the tensioner, service limit type specs.
I guess oil staining will tell how far out it is.

[Higdonaw]

Good points! I have studied my shop manual for any info but it's not real detailed, IMO. Thanks