Oil leak

[Relax]

Where does it come from?
What do I do?

It's  not much , and so far, only on front end (like pic) on both side. Not so much on left side, though.

[98valk]

from assembly line tacking sealant on o-rings to hold them in place. just clean it off, there is nothing wrong.

[RonW]

Agreed, coffee stains in that area usually means the o-ring is leaking. Perhaps check the torque on the intake runner's two bolts.

[The emperor has no clothes]

It's a very common thing. No oil leak. You need new o-rings.

[sandy]

If you have an Oring seal store in your area, use a #123 size and try to get Viton material. It's impervious to engine heat and petroleum distillates.

[Valkorado]

If you have an Oring seal store in your area, use a #123 size and try to get Viton material. It's impervious to engine heat and petroleum distillates.

Also using the viton.  Sure seems to extend the time between changes.   

[Relax]

I m out for a longer day-ride tomorrow,,,and thanks to you folks, I¨ll do it without worries.

If I need to replace the O-rings, do I just remove bolts, twist the bend out , replace O-rings ,and re-install them?

I'll check the torque first though, maybe it solve the matter

[98valk]

If the O-ring was leaking the engine would have major vacuum leaks causing erratic idling and running down the road.

The O-Ring has not failed and it is not leaking anything. The high tack is melting off and draining onto the head.
That is all that brown looking stain is and nothing else.

High Tack specs.

Melting point / freezing point No information available
Boiling point / boiling range 57 °C / 135 °F

https://www.permatex.com/wp-content/uploads/sds/80062.pdf
https://www.permatex.com/products/gasketing/gasket-sealants/permatex-high-tack-gasket-sealant-4-oz/

OEM O-rings are made of Buna-N aka Nitril
good chance Honda used the higher temp type Buna-N.

Sulfur-Cured:

Standard Low Temp: -35°C (-31°F)
Standard High Temp: 120°C (248°F)

Peroxide-Cured:

Standard Low Temp: -29°C (-20°F)
Standard High Temp: 135°C (275°F)

https://www.globaloring.com/buna-nitrile-o-rings/

[RonW]

Did not know that about the factory tacking sealant on the o-rings. On my bike though the coffee stain was on a very wide area and getting larger by the week. Even if it doesn't affect performance how would you stop the sealant from keeping on bleeding out? I replaced the o-rings and no more sealant leak.

[The emperor has no clothes]

I m out for a longer day-ride tomorrow,,,and thanks to you folks, I¨ll do it without worries.

If I need to replace the O-rings, do I just remove bolts, twist the bend out , replace O-rings ,and re-install them?

I'll check the torque first though, maybe it solve the matter

correct, the only thing to watch for is the o-ring falling out on reinstalling. Easy job 

[The emperor has no clothes]

Did not know that about the factory tacking sealant on the o-rings. On my bike though the coffee stain was on a very wide area and getting larger by the week. Even if it doesn't affect performance how would you stop the sealant from keeping on bleeding out? I replaced the o-rings and no more sealant leak.

Not to get in a pissing match about a simple fix. I'm sure you'll remember Ron when you removed the old o-rings they were flattened out. Looks like Relax's are just starting the process. It will continue to get worse. (Regardless of the Honda sealant mumbo jumbo)

[RonW]

Yea, flattened. I don't think the o-rings can be reused.

[The emperor has no clothes]

Yea, flattened. I don't think the o-rings can be reused.

They are dirt cheap. It would be dumb to reuse them.

[RonW]

correct, the only thing to watch for is the o-ring falling out on reinstalling. Easy job  

Perhaps use the equivalent of tacking sealant to hold the o-rings in it's groove since the o-ring is suspended upside down on install. Took me a few tries. Just kept thinking is that o-ring still fully in its groove?? Some people used grease if memory serves.

[The emperor has no clothes]

correct, the only thing to watch for is the o-ring falling out on reinstalling. Easy job 

Perhaps use something like the tacking sealant to hold the o-rings in it's groove since the o-ring is suspended upside down on install. Took me a few tries. Just kept thinking is that o-ring still fully in its groove?? Some people used grease if memory serves.

I think out of 12 that I've done, 2 or 3 needed a little something to hold them in. I think I used the tiniest dab of gasket sealant.

[RonW]

I re-checked the o-rings unnecessarily for sure. Just one of those kind of things.

[98valk]

Did not know that about the factory tacking sealant on the o-rings. On my bike though the coffee stain was on a very wide area and getting larger by the week. Even if it doesn't affect performance how would you stop the sealant from keeping on bleeding out? I replaced the o-rings and no more sealant leak.

Not to get in a pissing match about a simple fix. I'm sure you'll remember Ron when you removed the old o-rings they were flattened out. Looks like Relax's are just starting the process. It will continue to get worse. (Regardless of the Honda sealant mumbo jumbo)

the O-rings flattening are part of the sealing function, how much they flattened determines if they can be re-used or not is the criteria. I re-used the OEM O-rings three times and they still didn't leak.  Since I worked with o-rings in the marine industry and for this application, I knew how many times they could be re-used. In other applications o-rings need to be replaced each time, applications and system contents cause that requirement.

[Chrisj CMA]

I m out for a longer day-ride tomorrow,,,and thanks to you folks, I¨ll do it without worries.

If I need to replace the O-rings, do I just remove bolts, twist the bend out , replace O-rings ,and re-install them?

I'll check the torque first though, maybe it solve the matter

There's a lot less stress on the metal sealing faces if you remove all six bolts on one side so you can lift the intake higher before twisting it out. Then change the O-rings one at a time on that side. Then torque down all six before going to the other side

[The emperor has no clothes]

I m out for a longer day-ride tomorrow,,,and thanks to you folks, I¨ll do it without worries.

If I need to replace the O-rings, do I just remove bolts, twist the bend out , replace O-rings ,and re-install them?

I'll check the torque first though, maybe it solve the matter

There's a lot less stress on the metal sealing faces if you remove all six bolts on one side so you can lift the intake higher before twisting it out. Then change the O-rings one at a time on that side. Then torque down all six before going to the other side

good tip 

[John Schmidt]

What I've done in the past; loosen the 6 bolts on one side about a quarter of the way, remove the six on the other side...that's the side you're changing first. I've never loosened and twisted the intake runner to r&r the intake orings, just not needed. I do use a bit of gasket seal to hold them in place, maybe as much as a drop on opposite sides. Then set that side down in place and install the 6 bolts but leave them loose at this point. Move to the other side and remove the bolts and repeat the operation. Once all 6 orings are in place then torque them down.

[Relax]

I cleaned the area and tighten the nuts a very, VERY,  tiny bit.
I also checked all other nuts on both sides, it was nothing to tigh.

My wfe and I had a nice 250 miles ride yesterday, and I, ofc , kept an eye on the area, no oil drops anymore (so far, at least)

I'll keep watching the area, and order in the O-rings, just in case.

Thanks, all of you!