I have reused many Cometic side cover gaskets and never had a problem with them. OEM's well they are 1 time use but the Cometics on the 660 work great when reusing. I have used 1 about 6 times now and it do leak a drop out of that cover. Sounds like you can only use OEM on a 700 though. I would not reuse a OEM one they suck to try to seal up the 2nd time and its not worth it IMO.Probably just messed it up re-installing. Go OEM, way cheaper and no sense in buying something that expense when OEM with do the job. :thumbsup:
When you take the case off make sure and clean off all the old gasket and don't nick the case.
Rappy don't reuse them.