Oil leak on EC300 expansion pipe

[colinmc400]

Guys, got one ride on my 06 ec300 having just had the piston and rings done, as well as lots of other planned maint type stuff. I notice there is oil leaking from the flange the front pipe mounts onto, on the front face of the cylinder. Did i read on here that one of these holes is not blind and needs sealed when the bolt goes back in? I also get the impression that that mounting spiggot/flange that the pipe slips onto can crack and leak(as i see Nth Tahoe m'sport offer a ss version). Any ideas would be welcome before i tear it down.

Sorry one is a bit blurred, but its the bolt at the 3 oclock position. I have added a couple of bigger pics in the gallery.

Any comments would be greatfully received.

[Brian VT]

The stock spigot is somewhat fragile. I would suggest replacing it with the LTR unit even if it's ok now. It's cheap insurance.

[Boomhauer]

Maybe your O-rings on the spigot need to be replaced. I replace mine once a year as I do not like oil leaks.

Also you could have had a few hard impacts that resulted in deforming the part of your pipe that goes over the spigot.

[fury1]

I thought the spigot on the older bikes were a weak link if your pipe took a hit,I was pretty sure in 04 or 05 they started making them stronger?

[eff]

Not '04. I broke mine and don't even know exactly when it happened.

[GMP]

Is the flange tight on the cylinder? The '06 should be a steel flange.

Do you have the GG pipe?

I noticed that my '07 seems to leak a very small amount of spooge from the spigot/pipe a lot quicker after an o-ring swap than my '00 and '03 did. I think the pipe flange is just not as snug a compression fit on the o-rings as the FMF. All I did was clean everything up perfect with contact cleaner, and use hi temp RTV on the o-rings instead of grease. Seemed to solve the problem so far.

I imagine if the pipe is even slightly tweaked at teh spigot this situation will be aggrevated.