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Coagulated Indian Head gasket Sealer
I was thinking Gasgacinch.
Is this the first time you've removed the rocker cover ? Is it something from any of the previous owners ? In other words , do you know how long it's been there ? Peter Formerly from Ottawa
I'd go with Giacomo Agostinni's dried blood. It will make the bike worth a lot more at re-sale.
It looks like this stuff. https://www.autozone.com/sealants-glues-adhesives-and-tape/sealant/permatex-high-tack-gasket-sealant-4-oz/554063_0_0?spps.s=879&cmpid=LIA:US:EN:AD:NL:1000000:GEN:71700000069889792&gclid=EAIaIQobChMI_v3atvnT8AIVYB-tBh3EmwerEAQYBSABEgIEH_D_BwE&gclsrc=aw.dsHigh Tack is really hard to remove, though, and I wouldn’t use it on both sides of a valve cover gasket. I’ve seen it put on only one side of a gasket (here, the cylinder side) to hold the gasket in place through multiple removals of the cover.
^ When I saw him he was on an MV Agusta . Peter