Sounds like your leak is at the inboard side of the head cover gasket. Is that correct? If it is, there are four things that could have caused it:
- Gasket improperly installed.
- Rubber heat mat (or other foreign matter) pinched between the top of the head and the gasket. Lots of us have done this, myself included.
- Somebody applied sealer to the entire gasket and left gaps. The only parts of the gasket that require that are the two semicircular parts you see in the picture.
- Spontaneous gasket failure. Very, very unlikely.
As I said earlier, these gaskets aren't wear items and one set will last the life of the bike if not abused when removed or installed.
--Mark
Thanks for the advise.. As i have broke one of the screw... hopefully when the shop reopen tomorrow and they have stock on hand. Will just torque down a bit more say 8ft.lb instead of 7 and monitor again. Not serious as the leakage is mirror.
I guess the second cause is the most likelihood that casues the leakage. How should that be fixed? Replaced the gasket?