Terrible Cam Chain Noise

Hello,

Just recently got my 1980 kz550 runnin' with the help of some people on here showing me where the vacuum lines go.(Thank You). And I have found it runs awesome but there is some terrible cam chain noise. So, I am pretty new to bikes but I figure it needs a cam chain tensioner and or guides. So, any tips on this would be greatly appreciated so I can figure out what to order and maybe a few wise words before I jump into this. I have been a mechanic for years but I am pretty new to bikes. It's pretty similar but I know how far a few wise words from a seasoned veteran can go.

thanks,
Nick

These bikes have both a Cam Chain, and a Primary chain. The primary chain can also be a noise maker. The cam chain is the Hi-vo multi link design, and there is a stretch limit measurement in your service manual. Here is a diagram of the parts.


Then if you need the chain replaced etc, you can do it with the top end torn down. A master link and rivet tool will break the OEM chain and rivet it back together. Of course at that time Rings and valve work would be required more than likely as if the chain is loose, unless it has been done, the top end is probably due for service.

Yep, you have both the cam and primary chains.

Cam chain noise can be fixed rather easily. Just rotate the crank to TDC and remove the cam chain tentioner. Inspect the tentioner shafts/crosswedge for any burring/wear that would prevent it from sliding forward easily. These parts can be lightly sanded back to a smooth operating condition. Make sure to oil thoroughly before re-install - thats it. The crosswedge spring design means it auto-adjusts to the correct depth and wont back out.

The primary chain is a different story.
They tend to stretch which is normal, but to replace one is a dandy chore.
The one thing that is critical to eliminating primary chain noise is a very accurate vacuum syncronization. It wont cure the problem entirely, but makes it much smoother and totally tolerable.
You need a good accurate manometer. A home-made one will work, but takes a little more effort than just dropping the $100 on a carbtune pro/2.

Good luck.