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Bike Is a 2011 cbr600rr with just over 11k miles. Did the oil change with Honda 10w40 synthetic and an oem filter. Noticed the weep hole right under the header was leaking from the cylinder on the left(clutch side) of the bike. Read that the hole is to let any oil that gets to the spark plug leaks out. Figured it was the valve cover gasket because that should be the only thing that would let oil get there. Changed the gasket and leaking from the weep hole still. Any ideas? Thanks in advance
 

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Sorry I don't think I was clear the oil was on the back of the plug where the cool pack goes on it. The rest of the plug was dry. And no compression tester at the moment. Snap on guy still has it but here is a picture of where the leak is. Thanks for the idea though. Really appreciate any help
 

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Anyone else have any ideas? Took the valve cover off again. Saw where it was leaking from. Put silicone on it. Let it dry for 24 hours and still leaking. Not as much but still leaking none the less.
 

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I wiped it up and it was oil. Everything was already dry. And after the bike warmed up you see the oil leaking out of the hole right under the header. Saw online that it's a drain for the spark plug sleeve. And saw where it leaked through the gasket. Sealed it with silicone and leaking way less but still saw it coming out. Gasket is new.
 

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Wonder if its from the gaskets under the cam holders, most people see the ones on the valve cover but if you go in further each cylinder has another one under the cam holders.
12395-MBW-003 is the part number for those four.
 

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Wonder if its from the gaskets under the cam holders, most people see the ones on the valve cover but if you go in further each cylinder has another one under the cam holders.
12395-MBW-003 is the part number for those four.
Ding ding!!! This^^^

Love responses from people who have zero idea what they are talking about. It's why I'm such a stickler when it comes to wrong info being posted but it just seems to get perpetuated on this forum so much, it's hard to keep up.....

OP, you need to start over with all new seals and NOT use silicone on a valve cover but instead the proper high temp Honda liquid gasket (or equivalent). Read your service manual for proper instructions on how to properly do it and what to use.

The other thing you need to do is figure out why it was leaking in the first place. Is there a crack in the cover? Did someone else have it off for some reason? Crack in the head? You might be fixing symptoms, not the problem. My thought may be someone tried to do a valve check and screwed up the gasket or lost a seal, it started leaking and they sold the bike. Just a thought, no idea on its history.

And the holes you are talking about are drain holes mostly for moisture, not exactly for leaking oil. If you ride in a pouring rain or soak your bike washing it they should drain away water from shorting out a plug or coil pack. They will drain oil in extreme situations, though.
 
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