KZ1100 valve cover rubbers

Put new rubbers in last summer never did quit leaking so I'm gonna take it apart again due to a valve cover bolt needing a helpful. Question does rubbers need replaced or can they be reused?

Rubbers? You talking about the half moon pieces? If so they can be reused. Clean all the old oil away using brake cleaner or similar and bond them into the head on the curved area using some good quality sealer.

Both front plugs started leaking a couple weeks back, so I decided to go in for a lash adjustment after 4500 miles. I replaced only those two with new OEM plugs, but left the rear alone since the curved seals were still intact.
It helps to collect foreseen needed maintenance parts ahead of time, when you can find them reasonably priced. Then you are likely to be ready with parts, and only need to get motivated enough to do it. :lol:

IMO, accept no substitute for OEM Genuine Kawasaki parts!!!

Oem kawasaki parts are tough to find, and super expensive when you do. I need to helicoil front left valve cover bolt anyway while I have it apart. I'll likely check valves too. I have some shims already. I believe the half moon rubber inserts I have are factory.. At least that was inferred when I bought them.

76KZ900 wrote: Oem kawasaki parts are tough to find, and super expensive when you do. I need to helicoil front left valve cover bolt anyway while I have it apart. I'll likely check valves too. I have some shims already. I believe the half moon rubber inserts I have are factory.. At least that was inferred when I bought them.

Those half moon pieces are showing as still available from Kawasaki. Not hard to find, just go to your local dealer or order online. I agree that they are not cheap though... P/N 92066-1552

Nessism wrote:

76KZ900 wrote: Oem kawasaki parts are tough to find, and super expensive when you do. I need to helicoil front left valve cover bolt anyway while I have it apart. I'll likely check valves too. I have some shims already. I believe the half moon rubber inserts I have are factory.. At least that was inferred when I bought them.

Those half moon pieces are showing as still available from Kawasaki. Not hard to find, just go to your local dealer or order online. I agree that they are not cheap though... P/N 92066-1552

So other then NOS OEM, and those that are NOS, ... who knows how old, ...what aftermarket product is good?
My new ones probably have less then 300 miles on them and already are very slightly weeping or damp/wet after only 50-75 mile ride.

No eBay APP ID and/or Cert ID defined in Kunena configurationThis is what I bought..

Look at this on eBay

missionkz wrote:

Nessism wrote:

76KZ900 wrote: Oem kawasaki parts are tough to find, and super expensive when you do. I need to helicoil front left valve cover bolt anyway while I have it apart. I'll likely check valves too. I have some shims already. I believe the half moon rubber inserts I have are factory.. At least that was inferred when I bought them.

Those half moon pieces are showing as still available from Kawasaki. Not hard to find, just go to your local dealer or order online. I agree that they are not cheap though... P/N 92066-1552

So other then NOS OEM, and those that are NOS, ... who knows how old, ...what aftermarket product is good?
My new ones probably have less then 300 miles on them and already are very slightly weeping or damp/wet after only 50-75 mile ride.

Did you bond them in place on the curved surface? If not, clean them really well and do so. Permatex Ultra Black or standard ThreeBond type sealer works well. You don't need to bond the flat area that the gasket sits on and it's best to bond them at the same you install the valve cover since the cover will hold them in the proper place while the adhesive drys.

Yes. Used black ultra for whole gasket surface, let sit before riding and still leaks. Stripped hole out left front valve cover bolt trying to stop leak.

Hopefully didn't strip an end-plug bolt hole :ohmy:

Helicoil, or Time Sert (for 6mm bolt) is better. Don't cobble it, whatever you do!

Yep.. Stripped left front corner bolt hole. Already have helicoil kit

I use ultra copper. Next time I might use three bond.
Steve